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1da177e4 LT |
1 | /* |
2 | * The low performance USB storage driver (ub). | |
3 | * | |
4 | * Copyright (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) | |
5 | * Copyright (C) 2004 Pete Zaitcev (zaitcev@yahoo.com) | |
6 | * | |
7 | * This work is a part of Linux kernel, is derived from it, | |
8 | * and is not licensed separately. See file COPYING for details. | |
9 | * | |
10 | * TODO (sorted by decreasing priority) | |
11 | * -- Do resets with usb_device_reset (needs a thread context, use khubd) | |
12 | * -- set readonly flag for CDs, set removable flag for CF readers | |
13 | * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch) | |
14 | * -- support pphaneuf's SDDR-75 with two LUNs (also broken capacity...) | |
15 | * -- special case some senses, e.g. 3a/0 -> no media present, reduce retries | |
16 | * -- verify the 13 conditions and do bulk resets | |
17 | * -- normal pool of commands instead of cmdv[]? | |
18 | * -- kill last_pipe and simply do two-state clearing on both pipes | |
19 | * -- verify protocol (bulk) from USB descriptors (maybe...) | |
20 | * -- highmem and sg | |
21 | * -- move top_sense and work_bcs into separate allocations (if they survive) | |
22 | * for cache purists and esoteric architectures. | |
23 | * -- prune comments, they are too volumnous | |
24 | * -- Exterminate P3 printks | |
25 | * -- Resove XXX's | |
26 | * -- Redo "benh's retries", perhaps have spin-up code to handle them. V:D=? | |
27 | */ | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/usb.h> | |
31 | #include <linux/blkdev.h> | |
32 | #include <linux/devfs_fs_kernel.h> | |
33 | #include <linux/timer.h> | |
34 | #include <scsi/scsi.h> | |
35 | ||
36 | #define DRV_NAME "ub" | |
37 | #define DEVFS_NAME DRV_NAME | |
38 | ||
39 | #define UB_MAJOR 180 | |
40 | ||
41 | /* | |
42 | * Definitions which have to be scattered once we understand the layout better. | |
43 | */ | |
44 | ||
45 | /* Transport (despite PR in the name) */ | |
46 | #define US_PR_BULK 0x50 /* bulk only */ | |
47 | ||
48 | /* Protocol */ | |
49 | #define US_SC_SCSI 0x06 /* Transparent */ | |
50 | ||
51 | /* | |
52 | */ | |
53 | #define UB_MINORS_PER_MAJOR 8 | |
54 | ||
55 | #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */ | |
56 | ||
57 | #define UB_SENSE_SIZE 18 | |
58 | ||
59 | /* | |
60 | */ | |
61 | ||
62 | /* command block wrapper */ | |
63 | struct bulk_cb_wrap { | |
64 | __le32 Signature; /* contains 'USBC' */ | |
65 | u32 Tag; /* unique per command id */ | |
66 | __le32 DataTransferLength; /* size of data */ | |
67 | u8 Flags; /* direction in bit 0 */ | |
68 | u8 Lun; /* LUN normally 0 */ | |
69 | u8 Length; /* of of the CDB */ | |
70 | u8 CDB[UB_MAX_CDB_SIZE]; /* max command */ | |
71 | }; | |
72 | ||
73 | #define US_BULK_CB_WRAP_LEN 31 | |
74 | #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */ | |
75 | #define US_BULK_FLAG_IN 1 | |
76 | #define US_BULK_FLAG_OUT 0 | |
77 | ||
78 | /* command status wrapper */ | |
79 | struct bulk_cs_wrap { | |
80 | __le32 Signature; /* should = 'USBS' */ | |
81 | u32 Tag; /* same as original command */ | |
82 | __le32 Residue; /* amount not transferred */ | |
83 | u8 Status; /* see below */ | |
84 | }; | |
85 | ||
86 | #define US_BULK_CS_WRAP_LEN 13 | |
87 | #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */ | |
88 | /* This is for Olympus Camedia digital cameras */ | |
89 | #define US_BULK_CS_OLYMPUS_SIGN 0x55425355 /* spells out 'USBU' */ | |
90 | #define US_BULK_STAT_OK 0 | |
91 | #define US_BULK_STAT_FAIL 1 | |
92 | #define US_BULK_STAT_PHASE 2 | |
93 | ||
94 | /* bulk-only class specific requests */ | |
95 | #define US_BULK_RESET_REQUEST 0xff | |
96 | #define US_BULK_GET_MAX_LUN 0xfe | |
97 | ||
98 | /* | |
99 | */ | |
100 | struct ub_dev; | |
101 | ||
102 | #define UB_MAX_REQ_SG 1 | |
103 | #define UB_MAX_SECTORS 64 | |
104 | ||
105 | /* | |
106 | * A second is more than enough for a 32K transfer (UB_MAX_SECTORS) | |
107 | * even if a webcam hogs the bus, but some devices need time to spin up. | |
108 | */ | |
109 | #define UB_URB_TIMEOUT (HZ*2) | |
110 | #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */ | |
111 | #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */ | |
112 | #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */ | |
113 | ||
114 | /* | |
115 | * An instance of a SCSI command in transit. | |
116 | */ | |
117 | #define UB_DIR_NONE 0 | |
118 | #define UB_DIR_READ 1 | |
119 | #define UB_DIR_ILLEGAL2 2 | |
120 | #define UB_DIR_WRITE 3 | |
121 | ||
122 | #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \ | |
123 | (((c)==UB_DIR_READ)? 'r': 'n')) | |
124 | ||
125 | enum ub_scsi_cmd_state { | |
126 | UB_CMDST_INIT, /* Initial state */ | |
127 | UB_CMDST_CMD, /* Command submitted */ | |
128 | UB_CMDST_DATA, /* Data phase */ | |
129 | UB_CMDST_CLR2STS, /* Clearing before requesting status */ | |
130 | UB_CMDST_STAT, /* Status phase */ | |
131 | UB_CMDST_CLEAR, /* Clearing a stall (halt, actually) */ | |
132 | UB_CMDST_SENSE, /* Sending Request Sense */ | |
133 | UB_CMDST_DONE /* Final state */ | |
134 | }; | |
135 | ||
136 | static char *ub_scsi_cmd_stname[] = { | |
137 | ". ", | |
138 | "Cmd", | |
139 | "dat", | |
140 | "c2s", | |
141 | "sts", | |
142 | "clr", | |
143 | "Sen", | |
144 | "fin" | |
145 | }; | |
146 | ||
147 | struct ub_scsi_cmd { | |
148 | unsigned char cdb[UB_MAX_CDB_SIZE]; | |
149 | unsigned char cdb_len; | |
150 | ||
151 | unsigned char dir; /* 0 - none, 1 - read, 3 - write. */ | |
152 | unsigned char trace_index; | |
153 | enum ub_scsi_cmd_state state; | |
154 | unsigned int tag; | |
155 | struct ub_scsi_cmd *next; | |
156 | ||
157 | int error; /* Return code - valid upon done */ | |
158 | unsigned int act_len; /* Return size */ | |
159 | unsigned char key, asc, ascq; /* May be valid if error==-EIO */ | |
160 | ||
161 | int stat_count; /* Retries getting status. */ | |
162 | ||
163 | /* | |
164 | * We do not support transfers from highmem pages | |
165 | * because the underlying USB framework does not do what we need. | |
166 | */ | |
167 | char *data; /* Requested buffer */ | |
168 | unsigned int len; /* Requested length */ | |
169 | // struct scatterlist sgv[UB_MAX_REQ_SG]; | |
170 | ||
171 | void (*done)(struct ub_dev *, struct ub_scsi_cmd *); | |
172 | void *back; | |
173 | }; | |
174 | ||
175 | /* | |
176 | */ | |
177 | struct ub_capacity { | |
178 | unsigned long nsec; /* Linux size - 512 byte sectors */ | |
179 | unsigned int bsize; /* Linux hardsect_size */ | |
180 | unsigned int bshift; /* Shift between 512 and hard sects */ | |
181 | }; | |
182 | ||
183 | /* | |
184 | * The SCSI command tracing structure. | |
185 | */ | |
186 | ||
187 | #define SCMD_ST_HIST_SZ 8 | |
188 | #define SCMD_TRACE_SZ 63 /* Less than 4KB of 61-byte lines */ | |
189 | ||
190 | struct ub_scsi_cmd_trace { | |
191 | int hcur; | |
192 | unsigned int tag; | |
193 | unsigned int req_size, act_size; | |
194 | unsigned char op; | |
195 | unsigned char dir; | |
196 | unsigned char key, asc, ascq; | |
197 | char st_hst[SCMD_ST_HIST_SZ]; | |
198 | }; | |
199 | ||
200 | struct ub_scsi_trace { | |
201 | int cur; | |
202 | struct ub_scsi_cmd_trace vec[SCMD_TRACE_SZ]; | |
203 | }; | |
204 | ||
205 | /* | |
206 | * This is a direct take-off from linux/include/completion.h | |
207 | * The difference is that I do not wait on this thing, just poll. | |
208 | * When I want to wait (ub_probe), I just use the stock completion. | |
209 | * | |
210 | * Note that INIT_COMPLETION takes no lock. It is correct. But why | |
211 | * in the bloody hell that thing takes struct instead of pointer to struct | |
212 | * is quite beyond me. I just copied it from the stock completion. | |
213 | */ | |
214 | struct ub_completion { | |
215 | unsigned int done; | |
216 | spinlock_t lock; | |
217 | }; | |
218 | ||
219 | static inline void ub_init_completion(struct ub_completion *x) | |
220 | { | |
221 | x->done = 0; | |
222 | spin_lock_init(&x->lock); | |
223 | } | |
224 | ||
225 | #define UB_INIT_COMPLETION(x) ((x).done = 0) | |
226 | ||
227 | static void ub_complete(struct ub_completion *x) | |
228 | { | |
229 | unsigned long flags; | |
230 | ||
231 | spin_lock_irqsave(&x->lock, flags); | |
232 | x->done++; | |
233 | spin_unlock_irqrestore(&x->lock, flags); | |
234 | } | |
235 | ||
236 | static int ub_is_completed(struct ub_completion *x) | |
237 | { | |
238 | unsigned long flags; | |
239 | int ret; | |
240 | ||
241 | spin_lock_irqsave(&x->lock, flags); | |
242 | ret = x->done; | |
243 | spin_unlock_irqrestore(&x->lock, flags); | |
244 | return ret; | |
245 | } | |
246 | ||
247 | /* | |
248 | */ | |
249 | struct ub_scsi_cmd_queue { | |
250 | int qlen, qmax; | |
251 | struct ub_scsi_cmd *head, *tail; | |
252 | }; | |
253 | ||
254 | /* | |
255 | * The UB device instance. | |
256 | */ | |
257 | struct ub_dev { | |
258 | spinlock_t lock; | |
259 | int id; /* Number among ub's */ | |
260 | atomic_t poison; /* The USB device is disconnected */ | |
261 | int openc; /* protected by ub_lock! */ | |
262 | /* kref is too implicit for our taste */ | |
263 | unsigned int tagcnt; | |
264 | int changed; /* Media was changed */ | |
265 | int removable; | |
266 | int readonly; | |
267 | int first_open; /* Kludge. See ub_bd_open. */ | |
268 | char name[8]; | |
269 | struct usb_device *dev; | |
270 | struct usb_interface *intf; | |
271 | ||
272 | struct ub_capacity capacity; | |
273 | struct gendisk *disk; | |
274 | ||
275 | unsigned int send_bulk_pipe; /* cached pipe values */ | |
276 | unsigned int recv_bulk_pipe; | |
277 | unsigned int send_ctrl_pipe; | |
278 | unsigned int recv_ctrl_pipe; | |
279 | ||
280 | struct tasklet_struct tasklet; | |
281 | ||
282 | /* XXX Use Ingo's mempool (once we have more than one) */ | |
283 | int cmda[1]; | |
284 | struct ub_scsi_cmd cmdv[1]; | |
285 | ||
286 | struct ub_scsi_cmd_queue cmd_queue; | |
287 | struct ub_scsi_cmd top_rqs_cmd; /* REQUEST SENSE */ | |
288 | unsigned char top_sense[UB_SENSE_SIZE]; | |
289 | ||
290 | struct ub_completion work_done; | |
291 | struct urb work_urb; | |
292 | struct timer_list work_timer; | |
293 | int last_pipe; /* What might need clearing */ | |
294 | struct bulk_cb_wrap work_bcb; | |
295 | struct bulk_cs_wrap work_bcs; | |
296 | struct usb_ctrlrequest work_cr; | |
297 | ||
298 | struct ub_scsi_trace tr; | |
299 | }; | |
300 | ||
301 | /* | |
302 | */ | |
303 | static void ub_cleanup(struct ub_dev *sc); | |
304 | static int ub_bd_rq_fn_1(struct ub_dev *sc, struct request *rq); | |
305 | static int ub_cmd_build_block(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
306 | struct request *rq); | |
307 | static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
308 | struct request *rq); | |
309 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
310 | static void ub_end_rq(struct request *rq, int uptodate); | |
311 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
312 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt); | |
313 | static void ub_scsi_action(unsigned long _dev); | |
314 | static void ub_scsi_dispatch(struct ub_dev *sc); | |
315 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
316 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc); | |
317 | static void __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
318 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
319 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd); | |
320 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
321 | int stalled_pipe); | |
322 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd); | |
323 | static int ub_sync_tur(struct ub_dev *sc); | |
324 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_capacity *ret); | |
325 | ||
326 | /* | |
327 | */ | |
328 | static struct usb_device_id ub_usb_ids[] = { | |
329 | // { USB_DEVICE_VER(0x0781, 0x0002, 0x0009, 0x0009) }, /* SDDR-31 */ | |
330 | { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) }, | |
331 | { } | |
332 | }; | |
333 | ||
334 | MODULE_DEVICE_TABLE(usb, ub_usb_ids); | |
335 | ||
336 | /* | |
337 | * Find me a way to identify "next free minor" for add_disk(), | |
338 | * and the array disappears the next day. However, the number of | |
339 | * hosts has something to do with the naming and /proc/partitions. | |
340 | * This has to be thought out in detail before changing. | |
341 | * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure. | |
342 | */ | |
343 | #define UB_MAX_HOSTS 26 | |
344 | static char ub_hostv[UB_MAX_HOSTS]; | |
345 | static DEFINE_SPINLOCK(ub_lock); /* Locks globals and ->openc */ | |
346 | ||
347 | /* | |
348 | * The SCSI command tracing procedures. | |
349 | */ | |
350 | ||
351 | static void ub_cmdtr_new(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
352 | { | |
353 | int n; | |
354 | struct ub_scsi_cmd_trace *t; | |
355 | ||
356 | if ((n = sc->tr.cur + 1) == SCMD_TRACE_SZ) n = 0; | |
357 | t = &sc->tr.vec[n]; | |
358 | ||
359 | memset(t, 0, sizeof(struct ub_scsi_cmd_trace)); | |
360 | t->tag = cmd->tag; | |
361 | t->op = cmd->cdb[0]; | |
362 | t->dir = cmd->dir; | |
363 | t->req_size = cmd->len; | |
364 | t->st_hst[0] = cmd->state; | |
365 | ||
366 | sc->tr.cur = n; | |
367 | cmd->trace_index = n; | |
368 | } | |
369 | ||
370 | static void ub_cmdtr_state(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
371 | { | |
372 | int n; | |
373 | struct ub_scsi_cmd_trace *t; | |
374 | ||
375 | t = &sc->tr.vec[cmd->trace_index]; | |
376 | if (t->tag == cmd->tag) { | |
377 | if ((n = t->hcur + 1) == SCMD_ST_HIST_SZ) n = 0; | |
378 | t->st_hst[n] = cmd->state; | |
379 | t->hcur = n; | |
380 | } | |
381 | } | |
382 | ||
383 | static void ub_cmdtr_act_len(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
384 | { | |
385 | struct ub_scsi_cmd_trace *t; | |
386 | ||
387 | t = &sc->tr.vec[cmd->trace_index]; | |
388 | if (t->tag == cmd->tag) | |
389 | t->act_size = cmd->act_len; | |
390 | } | |
391 | ||
392 | static void ub_cmdtr_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
393 | unsigned char *sense) | |
394 | { | |
395 | struct ub_scsi_cmd_trace *t; | |
396 | ||
397 | t = &sc->tr.vec[cmd->trace_index]; | |
398 | if (t->tag == cmd->tag) { | |
399 | t->key = sense[2] & 0x0F; | |
400 | t->asc = sense[12]; | |
401 | t->ascq = sense[13]; | |
402 | } | |
403 | } | |
404 | ||
405 | static ssize_t ub_diag_show(struct device *dev, char *page) | |
406 | { | |
407 | struct usb_interface *intf; | |
408 | struct ub_dev *sc; | |
409 | int cnt; | |
410 | unsigned long flags; | |
411 | int nc, nh; | |
412 | int i, j; | |
413 | struct ub_scsi_cmd_trace *t; | |
414 | ||
415 | intf = to_usb_interface(dev); | |
416 | sc = usb_get_intfdata(intf); | |
417 | if (sc == NULL) | |
418 | return 0; | |
419 | ||
420 | cnt = 0; | |
421 | spin_lock_irqsave(&sc->lock, flags); | |
422 | ||
423 | cnt += sprintf(page + cnt, | |
424 | "qlen %d qmax %d changed %d removable %d readonly %d\n", | |
425 | sc->cmd_queue.qlen, sc->cmd_queue.qmax, | |
426 | sc->changed, sc->removable, sc->readonly); | |
427 | ||
428 | if ((nc = sc->tr.cur + 1) == SCMD_TRACE_SZ) nc = 0; | |
429 | for (j = 0; j < SCMD_TRACE_SZ; j++) { | |
430 | t = &sc->tr.vec[nc]; | |
431 | ||
432 | cnt += sprintf(page + cnt, "%08x %02x", t->tag, t->op); | |
433 | if (t->op == REQUEST_SENSE) { | |
434 | cnt += sprintf(page + cnt, " [sense %x %02x %02x]", | |
435 | t->key, t->asc, t->ascq); | |
436 | } else { | |
437 | cnt += sprintf(page + cnt, " %c", UB_DIR_CHAR(t->dir)); | |
438 | cnt += sprintf(page + cnt, " [%5d %5d]", | |
439 | t->req_size, t->act_size); | |
440 | } | |
441 | if ((nh = t->hcur + 1) == SCMD_ST_HIST_SZ) nh = 0; | |
442 | for (i = 0; i < SCMD_ST_HIST_SZ; i++) { | |
443 | cnt += sprintf(page + cnt, " %s", | |
444 | ub_scsi_cmd_stname[(int)t->st_hst[nh]]); | |
445 | if (++nh == SCMD_ST_HIST_SZ) nh = 0; | |
446 | } | |
447 | cnt += sprintf(page + cnt, "\n"); | |
448 | ||
449 | if (++nc == SCMD_TRACE_SZ) nc = 0; | |
450 | } | |
451 | ||
452 | spin_unlock_irqrestore(&sc->lock, flags); | |
453 | return cnt; | |
454 | } | |
455 | ||
456 | static DEVICE_ATTR(diag, S_IRUGO, ub_diag_show, NULL); /* N.B. World readable */ | |
457 | ||
458 | /* | |
459 | * The id allocator. | |
460 | * | |
461 | * This also stores the host for indexing by minor, which is somewhat dirty. | |
462 | */ | |
463 | static int ub_id_get(void) | |
464 | { | |
465 | unsigned long flags; | |
466 | int i; | |
467 | ||
468 | spin_lock_irqsave(&ub_lock, flags); | |
469 | for (i = 0; i < UB_MAX_HOSTS; i++) { | |
470 | if (ub_hostv[i] == 0) { | |
471 | ub_hostv[i] = 1; | |
472 | spin_unlock_irqrestore(&ub_lock, flags); | |
473 | return i; | |
474 | } | |
475 | } | |
476 | spin_unlock_irqrestore(&ub_lock, flags); | |
477 | return -1; | |
478 | } | |
479 | ||
480 | static void ub_id_put(int id) | |
481 | { | |
482 | unsigned long flags; | |
483 | ||
484 | if (id < 0 || id >= UB_MAX_HOSTS) { | |
485 | printk(KERN_ERR DRV_NAME ": bad host ID %d\n", id); | |
486 | return; | |
487 | } | |
488 | ||
489 | spin_lock_irqsave(&ub_lock, flags); | |
490 | if (ub_hostv[id] == 0) { | |
491 | spin_unlock_irqrestore(&ub_lock, flags); | |
492 | printk(KERN_ERR DRV_NAME ": freeing free host ID %d\n", id); | |
493 | return; | |
494 | } | |
495 | ub_hostv[id] = 0; | |
496 | spin_unlock_irqrestore(&ub_lock, flags); | |
497 | } | |
498 | ||
499 | /* | |
500 | * Downcount for deallocation. This rides on two assumptions: | |
501 | * - once something is poisoned, its refcount cannot grow | |
502 | * - opens cannot happen at this time (del_gendisk was done) | |
503 | * If the above is true, we can drop the lock, which we need for | |
504 | * blk_cleanup_queue(): the silly thing may attempt to sleep. | |
505 | * [Actually, it never needs to sleep for us, but it calls might_sleep()] | |
506 | */ | |
507 | static void ub_put(struct ub_dev *sc) | |
508 | { | |
509 | unsigned long flags; | |
510 | ||
511 | spin_lock_irqsave(&ub_lock, flags); | |
512 | --sc->openc; | |
513 | if (sc->openc == 0 && atomic_read(&sc->poison)) { | |
514 | spin_unlock_irqrestore(&ub_lock, flags); | |
515 | ub_cleanup(sc); | |
516 | } else { | |
517 | spin_unlock_irqrestore(&ub_lock, flags); | |
518 | } | |
519 | } | |
520 | ||
521 | /* | |
522 | * Final cleanup and deallocation. | |
523 | */ | |
524 | static void ub_cleanup(struct ub_dev *sc) | |
525 | { | |
526 | request_queue_t *q; | |
527 | ||
528 | /* I don't think queue can be NULL. But... Stolen from sx8.c */ | |
529 | if ((q = sc->disk->queue) != NULL) | |
530 | blk_cleanup_queue(q); | |
531 | ||
532 | /* | |
533 | * If we zero disk->private_data BEFORE put_disk, we have to check | |
534 | * for NULL all over the place in open, release, check_media and | |
535 | * revalidate, because the block level semaphore is well inside the | |
536 | * put_disk. But we cannot zero after the call, because *disk is gone. | |
537 | * The sd.c is blatantly racy in this area. | |
538 | */ | |
539 | /* disk->private_data = NULL; */ | |
540 | put_disk(sc->disk); | |
541 | sc->disk = NULL; | |
542 | ||
543 | ub_id_put(sc->id); | |
544 | kfree(sc); | |
545 | } | |
546 | ||
547 | /* | |
548 | * The "command allocator". | |
549 | */ | |
550 | static struct ub_scsi_cmd *ub_get_cmd(struct ub_dev *sc) | |
551 | { | |
552 | struct ub_scsi_cmd *ret; | |
553 | ||
554 | if (sc->cmda[0]) | |
555 | return NULL; | |
556 | ret = &sc->cmdv[0]; | |
557 | sc->cmda[0] = 1; | |
558 | return ret; | |
559 | } | |
560 | ||
561 | static void ub_put_cmd(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
562 | { | |
563 | if (cmd != &sc->cmdv[0]) { | |
564 | printk(KERN_WARNING "%s: releasing a foreign cmd %p\n", | |
565 | sc->name, cmd); | |
566 | return; | |
567 | } | |
568 | if (!sc->cmda[0]) { | |
569 | printk(KERN_WARNING "%s: releasing a free cmd\n", sc->name); | |
570 | return; | |
571 | } | |
572 | sc->cmda[0] = 0; | |
573 | } | |
574 | ||
575 | /* | |
576 | * The command queue. | |
577 | */ | |
578 | static void ub_cmdq_add(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
579 | { | |
580 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
581 | ||
582 | if (t->qlen++ == 0) { | |
583 | t->head = cmd; | |
584 | t->tail = cmd; | |
585 | } else { | |
586 | t->tail->next = cmd; | |
587 | t->tail = cmd; | |
588 | } | |
589 | ||
590 | if (t->qlen > t->qmax) | |
591 | t->qmax = t->qlen; | |
592 | } | |
593 | ||
594 | static void ub_cmdq_insert(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
595 | { | |
596 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
597 | ||
598 | if (t->qlen++ == 0) { | |
599 | t->head = cmd; | |
600 | t->tail = cmd; | |
601 | } else { | |
602 | cmd->next = t->head; | |
603 | t->head = cmd; | |
604 | } | |
605 | ||
606 | if (t->qlen > t->qmax) | |
607 | t->qmax = t->qlen; | |
608 | } | |
609 | ||
610 | static struct ub_scsi_cmd *ub_cmdq_pop(struct ub_dev *sc) | |
611 | { | |
612 | struct ub_scsi_cmd_queue *t = &sc->cmd_queue; | |
613 | struct ub_scsi_cmd *cmd; | |
614 | ||
615 | if (t->qlen == 0) | |
616 | return NULL; | |
617 | if (--t->qlen == 0) | |
618 | t->tail = NULL; | |
619 | cmd = t->head; | |
620 | t->head = cmd->next; | |
621 | cmd->next = NULL; | |
622 | return cmd; | |
623 | } | |
624 | ||
625 | #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head) | |
626 | ||
627 | /* | |
628 | * The request function is our main entry point | |
629 | */ | |
630 | ||
631 | static void ub_bd_rq_fn(request_queue_t *q) | |
632 | { | |
633 | struct ub_dev *sc = q->queuedata; | |
634 | struct request *rq; | |
635 | ||
636 | while ((rq = elv_next_request(q)) != NULL) { | |
637 | if (ub_bd_rq_fn_1(sc, rq) != 0) { | |
638 | blk_stop_queue(q); | |
639 | break; | |
640 | } | |
641 | } | |
642 | } | |
643 | ||
644 | static int ub_bd_rq_fn_1(struct ub_dev *sc, struct request *rq) | |
645 | { | |
646 | struct ub_scsi_cmd *cmd; | |
647 | int rc; | |
648 | ||
649 | if (atomic_read(&sc->poison) || sc->changed) { | |
650 | blkdev_dequeue_request(rq); | |
651 | ub_end_rq(rq, 0); | |
652 | return 0; | |
653 | } | |
654 | ||
655 | if ((cmd = ub_get_cmd(sc)) == NULL) | |
656 | return -1; | |
657 | memset(cmd, 0, sizeof(struct ub_scsi_cmd)); | |
658 | ||
659 | blkdev_dequeue_request(rq); | |
660 | ||
661 | if (blk_pc_request(rq)) { | |
662 | rc = ub_cmd_build_packet(sc, cmd, rq); | |
663 | } else { | |
664 | rc = ub_cmd_build_block(sc, cmd, rq); | |
665 | } | |
666 | if (rc != 0) { | |
667 | ub_put_cmd(sc, cmd); | |
668 | ub_end_rq(rq, 0); | |
669 | blk_start_queue(sc->disk->queue); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | cmd->state = UB_CMDST_INIT; | |
674 | cmd->done = ub_rw_cmd_done; | |
675 | cmd->back = rq; | |
676 | ||
677 | cmd->tag = sc->tagcnt++; | |
678 | if ((rc = ub_submit_scsi(sc, cmd)) != 0) { | |
679 | ub_put_cmd(sc, cmd); | |
680 | ub_end_rq(rq, 0); | |
681 | blk_start_queue(sc->disk->queue); | |
682 | return 0; | |
683 | } | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
688 | static int ub_cmd_build_block(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
689 | struct request *rq) | |
690 | { | |
691 | int ub_dir; | |
692 | #if 0 /* We use rq->buffer for now */ | |
693 | struct scatterlist *sg; | |
694 | int n_elem; | |
695 | #endif | |
696 | unsigned int block, nblks; | |
697 | ||
698 | if (rq_data_dir(rq) == WRITE) | |
699 | ub_dir = UB_DIR_WRITE; | |
700 | else | |
701 | ub_dir = UB_DIR_READ; | |
702 | ||
703 | /* | |
704 | * get scatterlist from block layer | |
705 | */ | |
706 | #if 0 /* We use rq->buffer for now */ | |
707 | sg = &cmd->sgv[0]; | |
708 | n_elem = blk_rq_map_sg(q, rq, sg); | |
709 | if (n_elem <= 0) { | |
710 | ub_put_cmd(sc, cmd); | |
711 | ub_end_rq(rq, 0); | |
712 | blk_start_queue(q); | |
713 | return 0; /* request with no s/g entries? */ | |
714 | } | |
715 | ||
716 | if (n_elem != 1) { /* Paranoia */ | |
717 | printk(KERN_WARNING "%s: request with %d segments\n", | |
718 | sc->name, n_elem); | |
719 | ub_put_cmd(sc, cmd); | |
720 | ub_end_rq(rq, 0); | |
721 | blk_start_queue(q); | |
722 | return 0; | |
723 | } | |
724 | #endif | |
725 | ||
726 | /* | |
727 | * XXX Unfortunately, this check does not work. It is quite possible | |
728 | * to get bogus non-null rq->buffer if you allow sg by mistake. | |
729 | */ | |
730 | if (rq->buffer == NULL) { | |
731 | /* | |
732 | * This must not happen if we set the queue right. | |
733 | * The block level must create bounce buffers for us. | |
734 | */ | |
735 | static int do_print = 1; | |
736 | if (do_print) { | |
737 | printk(KERN_WARNING "%s: unmapped block request" | |
738 | " flags 0x%lx sectors %lu\n", | |
739 | sc->name, rq->flags, rq->nr_sectors); | |
740 | do_print = 0; | |
741 | } | |
742 | return -1; | |
743 | } | |
744 | ||
745 | /* | |
746 | * build the command | |
747 | * | |
748 | * The call to blk_queue_hardsect_size() guarantees that request | |
749 | * is aligned, but it is given in terms of 512 byte units, always. | |
750 | */ | |
751 | block = rq->sector >> sc->capacity.bshift; | |
752 | nblks = rq->nr_sectors >> sc->capacity.bshift; | |
753 | ||
754 | cmd->cdb[0] = (ub_dir == UB_DIR_READ)? READ_10: WRITE_10; | |
755 | /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */ | |
756 | cmd->cdb[2] = block >> 24; | |
757 | cmd->cdb[3] = block >> 16; | |
758 | cmd->cdb[4] = block >> 8; | |
759 | cmd->cdb[5] = block; | |
760 | cmd->cdb[7] = nblks >> 8; | |
761 | cmd->cdb[8] = nblks; | |
762 | cmd->cdb_len = 10; | |
763 | ||
764 | cmd->dir = ub_dir; | |
765 | cmd->data = rq->buffer; | |
766 | cmd->len = rq->nr_sectors * 512; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
772 | struct request *rq) | |
773 | { | |
774 | ||
775 | if (rq->data_len != 0 && rq->data == NULL) { | |
776 | static int do_print = 1; | |
777 | if (do_print) { | |
778 | printk(KERN_WARNING "%s: unmapped packet request" | |
779 | " flags 0x%lx length %d\n", | |
780 | sc->name, rq->flags, rq->data_len); | |
781 | do_print = 0; | |
782 | } | |
783 | return -1; | |
784 | } | |
785 | ||
786 | memcpy(&cmd->cdb, rq->cmd, rq->cmd_len); | |
787 | cmd->cdb_len = rq->cmd_len; | |
788 | ||
789 | if (rq->data_len == 0) { | |
790 | cmd->dir = UB_DIR_NONE; | |
791 | } else { | |
792 | if (rq_data_dir(rq) == WRITE) | |
793 | cmd->dir = UB_DIR_WRITE; | |
794 | else | |
795 | cmd->dir = UB_DIR_READ; | |
796 | } | |
797 | cmd->data = rq->data; | |
798 | cmd->len = rq->data_len; | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
803 | static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
804 | { | |
805 | struct request *rq = cmd->back; | |
806 | struct gendisk *disk = sc->disk; | |
807 | request_queue_t *q = disk->queue; | |
808 | int uptodate; | |
809 | ||
810 | if (blk_pc_request(rq)) { | |
811 | /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */ | |
812 | memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE); | |
813 | rq->sense_len = UB_SENSE_SIZE; | |
814 | } | |
815 | ||
816 | if (cmd->error == 0) | |
817 | uptodate = 1; | |
818 | else | |
819 | uptodate = 0; | |
820 | ||
821 | ub_put_cmd(sc, cmd); | |
822 | ub_end_rq(rq, uptodate); | |
823 | blk_start_queue(q); | |
824 | } | |
825 | ||
826 | static void ub_end_rq(struct request *rq, int uptodate) | |
827 | { | |
828 | int rc; | |
829 | ||
830 | rc = end_that_request_first(rq, uptodate, rq->hard_nr_sectors); | |
831 | // assert(rc == 0); | |
832 | end_that_request_last(rq); | |
833 | } | |
834 | ||
835 | /* | |
836 | * Submit a regular SCSI operation (not an auto-sense). | |
837 | * | |
838 | * The Iron Law of Good Submit Routine is: | |
839 | * Zero return - callback is done, Nonzero return - callback is not done. | |
840 | * No exceptions. | |
841 | * | |
842 | * Host is assumed locked. | |
843 | * | |
844 | * XXX We only support Bulk for the moment. | |
845 | */ | |
846 | static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
847 | { | |
848 | ||
849 | if (cmd->state != UB_CMDST_INIT || | |
850 | (cmd->dir != UB_DIR_NONE && cmd->len == 0)) { | |
851 | return -EINVAL; | |
852 | } | |
853 | ||
854 | ub_cmdq_add(sc, cmd); | |
855 | /* | |
856 | * We can call ub_scsi_dispatch(sc) right away here, but it's a little | |
857 | * safer to jump to a tasklet, in case upper layers do something silly. | |
858 | */ | |
859 | tasklet_schedule(&sc->tasklet); | |
860 | return 0; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Submit the first URB for the queued command. | |
865 | * This function does not deal with queueing in any way. | |
866 | */ | |
867 | static int ub_scsi_cmd_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
868 | { | |
869 | struct bulk_cb_wrap *bcb; | |
870 | int rc; | |
871 | ||
872 | bcb = &sc->work_bcb; | |
873 | ||
874 | /* | |
875 | * ``If the allocation length is eighteen or greater, and a device | |
876 | * server returns less than eithteen bytes of data, the application | |
877 | * client should assume that the bytes not transferred would have been | |
878 | * zeroes had the device server returned those bytes.'' | |
879 | * | |
880 | * We zero sense for all commands so that when a packet request | |
881 | * fails it does not return a stale sense. | |
882 | */ | |
883 | memset(&sc->top_sense, 0, UB_SENSE_SIZE); | |
884 | ||
885 | /* set up the command wrapper */ | |
886 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
887 | bcb->Tag = cmd->tag; /* Endianness is not important */ | |
888 | bcb->DataTransferLength = cpu_to_le32(cmd->len); | |
889 | bcb->Flags = (cmd->dir == UB_DIR_READ) ? 0x80 : 0; | |
890 | bcb->Lun = 0; /* No multi-LUN yet */ | |
891 | bcb->Length = cmd->cdb_len; | |
892 | ||
893 | /* copy the command payload */ | |
894 | memcpy(bcb->CDB, cmd->cdb, UB_MAX_CDB_SIZE); | |
895 | ||
896 | UB_INIT_COMPLETION(sc->work_done); | |
897 | ||
898 | sc->last_pipe = sc->send_bulk_pipe; | |
899 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->send_bulk_pipe, | |
900 | bcb, US_BULK_CB_WRAP_LEN, ub_urb_complete, sc); | |
901 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
902 | ||
903 | /* Fill what we shouldn't be filling, because usb-storage did so. */ | |
904 | sc->work_urb.actual_length = 0; | |
905 | sc->work_urb.error_count = 0; | |
906 | sc->work_urb.status = 0; | |
907 | ||
908 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
909 | /* XXX Clear stalls */ | |
910 | printk("ub: cmd #%d start failed (%d)\n", cmd->tag, rc); /* P3 */ | |
911 | ub_complete(&sc->work_done); | |
912 | return rc; | |
913 | } | |
914 | ||
915 | sc->work_timer.expires = jiffies + UB_URB_TIMEOUT; | |
916 | add_timer(&sc->work_timer); | |
917 | ||
918 | cmd->state = UB_CMDST_CMD; | |
919 | ub_cmdtr_state(sc, cmd); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | /* | |
924 | * Timeout handler. | |
925 | */ | |
926 | static void ub_urb_timeout(unsigned long arg) | |
927 | { | |
928 | struct ub_dev *sc = (struct ub_dev *) arg; | |
929 | unsigned long flags; | |
930 | ||
931 | spin_lock_irqsave(&sc->lock, flags); | |
932 | usb_unlink_urb(&sc->work_urb); | |
933 | spin_unlock_irqrestore(&sc->lock, flags); | |
934 | } | |
935 | ||
936 | /* | |
937 | * Completion routine for the work URB. | |
938 | * | |
939 | * This can be called directly from usb_submit_urb (while we have | |
940 | * the sc->lock taken) and from an interrupt (while we do NOT have | |
941 | * the sc->lock taken). Therefore, bounce this off to a tasklet. | |
942 | */ | |
943 | static void ub_urb_complete(struct urb *urb, struct pt_regs *pt) | |
944 | { | |
945 | struct ub_dev *sc = urb->context; | |
946 | ||
947 | ub_complete(&sc->work_done); | |
948 | tasklet_schedule(&sc->tasklet); | |
949 | } | |
950 | ||
951 | static void ub_scsi_action(unsigned long _dev) | |
952 | { | |
953 | struct ub_dev *sc = (struct ub_dev *) _dev; | |
954 | unsigned long flags; | |
955 | ||
956 | spin_lock_irqsave(&sc->lock, flags); | |
957 | del_timer(&sc->work_timer); | |
958 | ub_scsi_dispatch(sc); | |
959 | spin_unlock_irqrestore(&sc->lock, flags); | |
960 | } | |
961 | ||
962 | static void ub_scsi_dispatch(struct ub_dev *sc) | |
963 | { | |
964 | struct ub_scsi_cmd *cmd; | |
965 | int rc; | |
966 | ||
967 | while ((cmd = ub_cmdq_peek(sc)) != NULL) { | |
968 | if (cmd->state == UB_CMDST_DONE) { | |
969 | ub_cmdq_pop(sc); | |
970 | (*cmd->done)(sc, cmd); | |
971 | } else if (cmd->state == UB_CMDST_INIT) { | |
972 | ub_cmdtr_new(sc, cmd); | |
973 | if ((rc = ub_scsi_cmd_start(sc, cmd)) == 0) | |
974 | break; | |
975 | cmd->error = rc; | |
976 | cmd->state = UB_CMDST_DONE; | |
977 | ub_cmdtr_state(sc, cmd); | |
978 | } else { | |
979 | if (!ub_is_completed(&sc->work_done)) | |
980 | break; | |
981 | ub_scsi_urb_compl(sc, cmd); | |
982 | } | |
983 | } | |
984 | } | |
985 | ||
986 | static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
987 | { | |
988 | struct urb *urb = &sc->work_urb; | |
989 | struct bulk_cs_wrap *bcs; | |
990 | int pipe; | |
991 | int rc; | |
992 | ||
993 | if (atomic_read(&sc->poison)) { | |
994 | /* A little too simplistic, I feel... */ | |
995 | goto Bad_End; | |
996 | } | |
997 | ||
998 | if (cmd->state == UB_CMDST_CLEAR) { | |
999 | if (urb->status == -EPIPE) { | |
1000 | /* | |
1001 | * STALL while clearning STALL. | |
1002 | * The control pipe clears itself - nothing to do. | |
1003 | * XXX Might try to reset the device here and retry. | |
1004 | */ | |
1005 | printk(KERN_NOTICE "%s: " | |
1006 | "stall on control pipe for device %u\n", | |
1007 | sc->name, sc->dev->devnum); | |
1008 | goto Bad_End; | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * We ignore the result for the halt clear. | |
1013 | */ | |
1014 | ||
1015 | /* reset the endpoint toggle */ | |
1016 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1017 | usb_pipeout(sc->last_pipe), 0); | |
1018 | ||
1019 | ub_state_sense(sc, cmd); | |
1020 | ||
1021 | } else if (cmd->state == UB_CMDST_CLR2STS) { | |
1022 | if (urb->status == -EPIPE) { | |
1023 | /* | |
1024 | * STALL while clearning STALL. | |
1025 | * The control pipe clears itself - nothing to do. | |
1026 | * XXX Might try to reset the device here and retry. | |
1027 | */ | |
1028 | printk(KERN_NOTICE "%s: " | |
1029 | "stall on control pipe for device %u\n", | |
1030 | sc->name, sc->dev->devnum); | |
1031 | goto Bad_End; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * We ignore the result for the halt clear. | |
1036 | */ | |
1037 | ||
1038 | /* reset the endpoint toggle */ | |
1039 | usb_settoggle(sc->dev, usb_pipeendpoint(sc->last_pipe), | |
1040 | usb_pipeout(sc->last_pipe), 0); | |
1041 | ||
1042 | ub_state_stat(sc, cmd); | |
1043 | ||
1044 | } else if (cmd->state == UB_CMDST_CMD) { | |
1045 | if (urb->status == -EPIPE) { | |
1046 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1047 | if (rc != 0) { | |
1048 | printk(KERN_NOTICE "%s: " | |
1049 | "unable to submit clear for device %u" | |
1050 | " (code %d)\n", | |
1051 | sc->name, sc->dev->devnum, rc); | |
1052 | /* | |
1053 | * This is typically ENOMEM or some other such shit. | |
1054 | * Retrying is pointless. Just do Bad End on it... | |
1055 | */ | |
1056 | goto Bad_End; | |
1057 | } | |
1058 | cmd->state = UB_CMDST_CLEAR; | |
1059 | ub_cmdtr_state(sc, cmd); | |
1060 | return; | |
1061 | } | |
1062 | if (urb->status != 0) { | |
1063 | printk("ub: cmd #%d cmd status (%d)\n", cmd->tag, urb->status); /* P3 */ | |
1064 | goto Bad_End; | |
1065 | } | |
1066 | if (urb->actual_length != US_BULK_CB_WRAP_LEN) { | |
1067 | printk("ub: cmd #%d xferred %d\n", cmd->tag, urb->actual_length); /* P3 */ | |
1068 | /* XXX Must do reset here to unconfuse the device */ | |
1069 | goto Bad_End; | |
1070 | } | |
1071 | ||
1072 | if (cmd->dir == UB_DIR_NONE) { | |
1073 | ub_state_stat(sc, cmd); | |
1074 | return; | |
1075 | } | |
1076 | ||
1077 | UB_INIT_COMPLETION(sc->work_done); | |
1078 | ||
1079 | if (cmd->dir == UB_DIR_READ) | |
1080 | pipe = sc->recv_bulk_pipe; | |
1081 | else | |
1082 | pipe = sc->send_bulk_pipe; | |
1083 | sc->last_pipe = pipe; | |
1084 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe, | |
1085 | cmd->data, cmd->len, ub_urb_complete, sc); | |
1086 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
1087 | sc->work_urb.actual_length = 0; | |
1088 | sc->work_urb.error_count = 0; | |
1089 | sc->work_urb.status = 0; | |
1090 | ||
1091 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1092 | /* XXX Clear stalls */ | |
1093 | printk("ub: data #%d submit failed (%d)\n", cmd->tag, rc); /* P3 */ | |
1094 | ub_complete(&sc->work_done); | |
1095 | ub_state_done(sc, cmd, rc); | |
1096 | return; | |
1097 | } | |
1098 | ||
1099 | sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT; | |
1100 | add_timer(&sc->work_timer); | |
1101 | ||
1102 | cmd->state = UB_CMDST_DATA; | |
1103 | ub_cmdtr_state(sc, cmd); | |
1104 | ||
1105 | } else if (cmd->state == UB_CMDST_DATA) { | |
1106 | if (urb->status == -EPIPE) { | |
1107 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1108 | if (rc != 0) { | |
1109 | printk(KERN_NOTICE "%s: " | |
1110 | "unable to submit clear for device %u" | |
1111 | " (code %d)\n", | |
1112 | sc->name, sc->dev->devnum, rc); | |
1113 | /* | |
1114 | * This is typically ENOMEM or some other such shit. | |
1115 | * Retrying is pointless. Just do Bad End on it... | |
1116 | */ | |
1117 | goto Bad_End; | |
1118 | } | |
1119 | cmd->state = UB_CMDST_CLR2STS; | |
1120 | ub_cmdtr_state(sc, cmd); | |
1121 | return; | |
1122 | } | |
1123 | if (urb->status == -EOVERFLOW) { | |
1124 | /* | |
1125 | * A babble? Failure, but we must transfer CSW now. | |
1126 | */ | |
1127 | cmd->error = -EOVERFLOW; /* A cheap trick... */ | |
1128 | } else { | |
1129 | if (urb->status != 0) | |
1130 | goto Bad_End; | |
1131 | } | |
1132 | ||
1133 | cmd->act_len = urb->actual_length; | |
1134 | ub_cmdtr_act_len(sc, cmd); | |
1135 | ||
1136 | ub_state_stat(sc, cmd); | |
1137 | ||
1138 | } else if (cmd->state == UB_CMDST_STAT) { | |
1139 | if (urb->status == -EPIPE) { | |
1140 | rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe); | |
1141 | if (rc != 0) { | |
1142 | printk(KERN_NOTICE "%s: " | |
1143 | "unable to submit clear for device %u" | |
1144 | " (code %d)\n", | |
1145 | sc->name, sc->dev->devnum, rc); | |
1146 | /* | |
1147 | * This is typically ENOMEM or some other such shit. | |
1148 | * Retrying is pointless. Just do Bad End on it... | |
1149 | */ | |
1150 | goto Bad_End; | |
1151 | } | |
1152 | cmd->state = UB_CMDST_CLEAR; | |
1153 | ub_cmdtr_state(sc, cmd); | |
1154 | return; | |
1155 | } | |
1156 | if (urb->status != 0) | |
1157 | goto Bad_End; | |
1158 | ||
1159 | if (urb->actual_length == 0) { | |
1160 | /* | |
1161 | * Some broken devices add unnecessary zero-length | |
1162 | * packets to the end of their data transfers. | |
1163 | * Such packets show up as 0-length CSWs. If we | |
1164 | * encounter such a thing, try to read the CSW again. | |
1165 | */ | |
1166 | if (++cmd->stat_count >= 4) { | |
1167 | printk(KERN_NOTICE "%s: " | |
1168 | "unable to get CSW on device %u\n", | |
1169 | sc->name, sc->dev->devnum); | |
1170 | goto Bad_End; | |
1171 | } | |
1172 | __ub_state_stat(sc, cmd); | |
1173 | return; | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Check the returned Bulk protocol status. | |
1178 | */ | |
1179 | ||
1180 | bcs = &sc->work_bcs; | |
1181 | rc = le32_to_cpu(bcs->Residue); | |
1182 | if (rc != cmd->len - cmd->act_len) { | |
1183 | /* | |
1184 | * It is all right to transfer less, the caller has | |
1185 | * to check. But it's not all right if the device | |
1186 | * counts disagree with our counts. | |
1187 | */ | |
1188 | /* P3 */ printk("%s: resid %d len %d act %d\n", | |
1189 | sc->name, rc, cmd->len, cmd->act_len); | |
1190 | goto Bad_End; | |
1191 | } | |
1192 | ||
1193 | #if 0 | |
1194 | if (bcs->Signature != cpu_to_le32(US_BULK_CS_SIGN) && | |
1195 | bcs->Signature != cpu_to_le32(US_BULK_CS_OLYMPUS_SIGN)) { | |
1196 | /* Windows ignores signatures, so do we. */ | |
1197 | } | |
1198 | #endif | |
1199 | ||
1200 | if (bcs->Tag != cmd->tag) { | |
1201 | /* | |
1202 | * This usually happens when we disagree with the | |
1203 | * device's microcode about something. For instance, | |
1204 | * a few of them throw this after timeouts. They buffer | |
1205 | * commands and reply at commands we timed out before. | |
1206 | * Without flushing these replies we loop forever. | |
1207 | */ | |
1208 | if (++cmd->stat_count >= 4) { | |
1209 | printk(KERN_NOTICE "%s: " | |
1210 | "tag mismatch orig 0x%x reply 0x%x " | |
1211 | "on device %u\n", | |
1212 | sc->name, cmd->tag, bcs->Tag, | |
1213 | sc->dev->devnum); | |
1214 | goto Bad_End; | |
1215 | } | |
1216 | __ub_state_stat(sc, cmd); | |
1217 | return; | |
1218 | } | |
1219 | ||
1220 | switch (bcs->Status) { | |
1221 | case US_BULK_STAT_OK: | |
1222 | break; | |
1223 | case US_BULK_STAT_FAIL: | |
1224 | ub_state_sense(sc, cmd); | |
1225 | return; | |
1226 | case US_BULK_STAT_PHASE: | |
1227 | /* XXX We must reset the transport here */ | |
1228 | /* P3 */ printk("%s: status PHASE\n", sc->name); | |
1229 | goto Bad_End; | |
1230 | default: | |
1231 | printk(KERN_INFO "%s: unknown CSW status 0x%x\n", | |
1232 | sc->name, bcs->Status); | |
1233 | goto Bad_End; | |
1234 | } | |
1235 | ||
1236 | /* Not zeroing error to preserve a babble indicator */ | |
1237 | cmd->state = UB_CMDST_DONE; | |
1238 | ub_cmdtr_state(sc, cmd); | |
1239 | ub_cmdq_pop(sc); | |
1240 | (*cmd->done)(sc, cmd); | |
1241 | ||
1242 | } else if (cmd->state == UB_CMDST_SENSE) { | |
1243 | ub_state_done(sc, cmd, -EIO); | |
1244 | ||
1245 | } else { | |
1246 | printk(KERN_WARNING "%s: " | |
1247 | "wrong command state %d on device %u\n", | |
1248 | sc->name, cmd->state, sc->dev->devnum); | |
1249 | goto Bad_End; | |
1250 | } | |
1251 | return; | |
1252 | ||
1253 | Bad_End: /* Little Excel is dead */ | |
1254 | ub_state_done(sc, cmd, -EIO); | |
1255 | } | |
1256 | ||
1257 | /* | |
1258 | * Factorization helper for the command state machine: | |
1259 | * Finish the command. | |
1260 | */ | |
1261 | static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc) | |
1262 | { | |
1263 | ||
1264 | cmd->error = rc; | |
1265 | cmd->state = UB_CMDST_DONE; | |
1266 | ub_cmdtr_state(sc, cmd); | |
1267 | ub_cmdq_pop(sc); | |
1268 | (*cmd->done)(sc, cmd); | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * Factorization helper for the command state machine: | |
1273 | * Submit a CSW read. | |
1274 | */ | |
1275 | static void __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1276 | { | |
1277 | int rc; | |
1278 | ||
1279 | UB_INIT_COMPLETION(sc->work_done); | |
1280 | ||
1281 | sc->last_pipe = sc->recv_bulk_pipe; | |
1282 | usb_fill_bulk_urb(&sc->work_urb, sc->dev, sc->recv_bulk_pipe, | |
1283 | &sc->work_bcs, US_BULK_CS_WRAP_LEN, ub_urb_complete, sc); | |
1284 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
1285 | sc->work_urb.actual_length = 0; | |
1286 | sc->work_urb.error_count = 0; | |
1287 | sc->work_urb.status = 0; | |
1288 | ||
1289 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1290 | /* XXX Clear stalls */ | |
1291 | printk("%s: CSW #%d submit failed (%d)\n", sc->name, cmd->tag, rc); /* P3 */ | |
1292 | ub_complete(&sc->work_done); | |
1293 | ub_state_done(sc, cmd, rc); | |
1294 | return; | |
1295 | } | |
1296 | ||
1297 | sc->work_timer.expires = jiffies + UB_STAT_TIMEOUT; | |
1298 | add_timer(&sc->work_timer); | |
1299 | } | |
1300 | ||
1301 | /* | |
1302 | * Factorization helper for the command state machine: | |
1303 | * Submit a CSW read and go to STAT state. | |
1304 | */ | |
1305 | static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1306 | { | |
1307 | __ub_state_stat(sc, cmd); | |
1308 | ||
1309 | cmd->stat_count = 0; | |
1310 | cmd->state = UB_CMDST_STAT; | |
1311 | ub_cmdtr_state(sc, cmd); | |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * Factorization helper for the command state machine: | |
1316 | * Submit a REQUEST SENSE and go to SENSE state. | |
1317 | */ | |
1318 | static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1319 | { | |
1320 | struct ub_scsi_cmd *scmd; | |
1321 | int rc; | |
1322 | ||
1323 | if (cmd->cdb[0] == REQUEST_SENSE) { | |
1324 | rc = -EPIPE; | |
1325 | goto error; | |
1326 | } | |
1327 | ||
1328 | scmd = &sc->top_rqs_cmd; | |
1329 | scmd->cdb[0] = REQUEST_SENSE; | |
1330 | scmd->cdb[4] = UB_SENSE_SIZE; | |
1331 | scmd->cdb_len = 6; | |
1332 | scmd->dir = UB_DIR_READ; | |
1333 | scmd->state = UB_CMDST_INIT; | |
1334 | scmd->data = sc->top_sense; | |
1335 | scmd->len = UB_SENSE_SIZE; | |
1336 | scmd->done = ub_top_sense_done; | |
1337 | scmd->back = cmd; | |
1338 | ||
1339 | scmd->tag = sc->tagcnt++; | |
1340 | ||
1341 | cmd->state = UB_CMDST_SENSE; | |
1342 | ub_cmdtr_state(sc, cmd); | |
1343 | ||
1344 | ub_cmdq_insert(sc, scmd); | |
1345 | return; | |
1346 | ||
1347 | error: | |
1348 | ub_state_done(sc, cmd, rc); | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * A helper for the command's state machine: | |
1353 | * Submit a stall clear. | |
1354 | */ | |
1355 | static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd, | |
1356 | int stalled_pipe) | |
1357 | { | |
1358 | int endp; | |
1359 | struct usb_ctrlrequest *cr; | |
1360 | int rc; | |
1361 | ||
1362 | endp = usb_pipeendpoint(stalled_pipe); | |
1363 | if (usb_pipein (stalled_pipe)) | |
1364 | endp |= USB_DIR_IN; | |
1365 | ||
1366 | cr = &sc->work_cr; | |
1367 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
1368 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
1369 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
1370 | cr->wIndex = cpu_to_le16(endp); | |
1371 | cr->wLength = cpu_to_le16(0); | |
1372 | ||
1373 | UB_INIT_COMPLETION(sc->work_done); | |
1374 | ||
1375 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
1376 | (unsigned char*) cr, NULL, 0, ub_urb_complete, sc); | |
1377 | sc->work_urb.transfer_flags = URB_ASYNC_UNLINK; | |
1378 | sc->work_urb.actual_length = 0; | |
1379 | sc->work_urb.error_count = 0; | |
1380 | sc->work_urb.status = 0; | |
1381 | ||
1382 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) { | |
1383 | ub_complete(&sc->work_done); | |
1384 | return rc; | |
1385 | } | |
1386 | ||
1387 | sc->work_timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
1388 | add_timer(&sc->work_timer); | |
1389 | return 0; | |
1390 | } | |
1391 | ||
1392 | /* | |
1393 | */ | |
1394 | static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd) | |
1395 | { | |
1396 | unsigned char *sense = scmd->data; | |
1397 | struct ub_scsi_cmd *cmd; | |
1398 | ||
1399 | /* | |
1400 | * Ignoring scmd->act_len, because the buffer was pre-zeroed. | |
1401 | */ | |
1402 | ub_cmdtr_sense(sc, scmd, sense); | |
1403 | ||
1404 | /* | |
1405 | * Find the command which triggered the unit attention or a check, | |
1406 | * save the sense into it, and advance its state machine. | |
1407 | */ | |
1408 | if ((cmd = ub_cmdq_peek(sc)) == NULL) { | |
1409 | printk(KERN_WARNING "%s: sense done while idle\n", sc->name); | |
1410 | return; | |
1411 | } | |
1412 | if (cmd != scmd->back) { | |
1413 | printk(KERN_WARNING "%s: " | |
1414 | "sense done for wrong command 0x%x on device %u\n", | |
1415 | sc->name, cmd->tag, sc->dev->devnum); | |
1416 | return; | |
1417 | } | |
1418 | if (cmd->state != UB_CMDST_SENSE) { | |
1419 | printk(KERN_WARNING "%s: " | |
1420 | "sense done with bad cmd state %d on device %u\n", | |
1421 | sc->name, cmd->state, sc->dev->devnum); | |
1422 | return; | |
1423 | } | |
1424 | ||
1425 | cmd->key = sense[2] & 0x0F; | |
1426 | cmd->asc = sense[12]; | |
1427 | cmd->ascq = sense[13]; | |
1428 | ||
1429 | ub_scsi_urb_compl(sc, cmd); | |
1430 | } | |
1431 | ||
1432 | #if 0 | |
1433 | /* Determine what the maximum LUN supported is */ | |
1434 | int usb_stor_Bulk_max_lun(struct us_data *us) | |
1435 | { | |
1436 | int result; | |
1437 | ||
1438 | /* issue the command */ | |
1439 | result = usb_stor_control_msg(us, us->recv_ctrl_pipe, | |
1440 | US_BULK_GET_MAX_LUN, | |
1441 | USB_DIR_IN | USB_TYPE_CLASS | | |
1442 | USB_RECIP_INTERFACE, | |
1443 | 0, us->ifnum, us->iobuf, 1, HZ); | |
1444 | ||
1445 | /* | |
1446 | * Some devices (i.e. Iomega Zip100) need this -- apparently | |
1447 | * the bulk pipes get STALLed when the GetMaxLUN request is | |
1448 | * processed. This is, in theory, harmless to all other devices | |
1449 | * (regardless of if they stall or not). | |
1450 | */ | |
1451 | if (result < 0) { | |
1452 | usb_stor_clear_halt(us, us->recv_bulk_pipe); | |
1453 | usb_stor_clear_halt(us, us->send_bulk_pipe); | |
1454 | } | |
1455 | ||
1456 | US_DEBUGP("GetMaxLUN command result is %d, data is %d\n", | |
1457 | result, us->iobuf[0]); | |
1458 | ||
1459 | /* if we have a successful request, return the result */ | |
1460 | if (result == 1) | |
1461 | return us->iobuf[0]; | |
1462 | ||
1463 | /* return the default -- no LUNs */ | |
1464 | return 0; | |
1465 | } | |
1466 | #endif | |
1467 | ||
1468 | /* | |
1469 | * This is called from a process context. | |
1470 | */ | |
1471 | static void ub_revalidate(struct ub_dev *sc) | |
1472 | { | |
1473 | ||
1474 | sc->readonly = 0; /* XXX Query this from the device */ | |
1475 | ||
1476 | sc->capacity.nsec = 0; | |
1477 | sc->capacity.bsize = 512; | |
1478 | sc->capacity.bshift = 0; | |
1479 | ||
1480 | if (ub_sync_tur(sc) != 0) | |
1481 | return; /* Not ready */ | |
1482 | sc->changed = 0; | |
1483 | ||
1484 | if (ub_sync_read_cap(sc, &sc->capacity) != 0) { | |
1485 | /* | |
1486 | * The retry here means something is wrong, either with the | |
1487 | * device, with the transport, or with our code. | |
1488 | * We keep this because sd.c has retries for capacity. | |
1489 | */ | |
1490 | if (ub_sync_read_cap(sc, &sc->capacity) != 0) { | |
1491 | sc->capacity.nsec = 0; | |
1492 | sc->capacity.bsize = 512; | |
1493 | sc->capacity.bshift = 0; | |
1494 | } | |
1495 | } | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * The open funcion. | |
1500 | * This is mostly needed to keep refcounting, but also to support | |
1501 | * media checks on removable media drives. | |
1502 | */ | |
1503 | static int ub_bd_open(struct inode *inode, struct file *filp) | |
1504 | { | |
1505 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
1506 | struct ub_dev *sc; | |
1507 | unsigned long flags; | |
1508 | int rc; | |
1509 | ||
1510 | if ((sc = disk->private_data) == NULL) | |
1511 | return -ENXIO; | |
1512 | spin_lock_irqsave(&ub_lock, flags); | |
1513 | if (atomic_read(&sc->poison)) { | |
1514 | spin_unlock_irqrestore(&ub_lock, flags); | |
1515 | return -ENXIO; | |
1516 | } | |
1517 | sc->openc++; | |
1518 | spin_unlock_irqrestore(&ub_lock, flags); | |
1519 | ||
1520 | /* | |
1521 | * This is a workaround for a specific problem in our block layer. | |
1522 | * In 2.6.9, register_disk duplicates the code from rescan_partitions. | |
1523 | * However, if we do add_disk with a device which persistently reports | |
1524 | * a changed media, add_disk calls register_disk, which does do_open, | |
1525 | * which will call rescan_paritions for changed media. After that, | |
1526 | * register_disk attempts to do it all again and causes double kobject | |
1527 | * registration and a eventually an oops on module removal. | |
1528 | * | |
1529 | * The bottom line is, Al Viro says that we should not allow | |
1530 | * bdev->bd_invalidated to be set when doing add_disk no matter what. | |
1531 | */ | |
1532 | if (sc->first_open) { | |
1533 | if (sc->changed) { | |
1534 | sc->first_open = 0; | |
1535 | rc = -ENOMEDIUM; | |
1536 | goto err_open; | |
1537 | } | |
1538 | } | |
1539 | ||
1540 | if (sc->removable || sc->readonly) | |
1541 | check_disk_change(inode->i_bdev); | |
1542 | ||
1543 | /* | |
1544 | * The sd.c considers ->media_present and ->changed not equivalent, | |
1545 | * under some pretty murky conditions (a failure of READ CAPACITY). | |
1546 | * We may need it one day. | |
1547 | */ | |
1548 | if (sc->removable && sc->changed && !(filp->f_flags & O_NDELAY)) { | |
1549 | rc = -ENOMEDIUM; | |
1550 | goto err_open; | |
1551 | } | |
1552 | ||
1553 | if (sc->readonly && (filp->f_mode & FMODE_WRITE)) { | |
1554 | rc = -EROFS; | |
1555 | goto err_open; | |
1556 | } | |
1557 | ||
1558 | return 0; | |
1559 | ||
1560 | err_open: | |
1561 | ub_put(sc); | |
1562 | return rc; | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | */ | |
1567 | static int ub_bd_release(struct inode *inode, struct file *filp) | |
1568 | { | |
1569 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
1570 | struct ub_dev *sc = disk->private_data; | |
1571 | ||
1572 | ub_put(sc); | |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | /* | |
1577 | * The ioctl interface. | |
1578 | */ | |
1579 | static int ub_bd_ioctl(struct inode *inode, struct file *filp, | |
1580 | unsigned int cmd, unsigned long arg) | |
1581 | { | |
1582 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
1583 | void __user *usermem = (void __user *) arg; | |
1584 | ||
1585 | return scsi_cmd_ioctl(filp, disk, cmd, usermem); | |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * This is called once a new disk was seen by the block layer or by ub_probe(). | |
1590 | * The main onjective here is to discover the features of the media such as | |
1591 | * the capacity, read-only status, etc. USB storage generally does not | |
1592 | * need to be spun up, but if we needed it, this would be the place. | |
1593 | * | |
1594 | * This call can sleep. | |
1595 | * | |
1596 | * The return code is not used. | |
1597 | */ | |
1598 | static int ub_bd_revalidate(struct gendisk *disk) | |
1599 | { | |
1600 | struct ub_dev *sc = disk->private_data; | |
1601 | ||
1602 | ub_revalidate(sc); | |
1603 | /* This is pretty much a long term P3 */ | |
1604 | if (!atomic_read(&sc->poison)) { /* Cover sc->dev */ | |
1605 | printk(KERN_INFO "%s: device %u capacity nsec %ld bsize %u\n", | |
1606 | sc->name, sc->dev->devnum, | |
1607 | sc->capacity.nsec, sc->capacity.bsize); | |
1608 | } | |
1609 | ||
1610 | /* XXX Support sector size switching like in sr.c */ | |
1611 | blk_queue_hardsect_size(disk->queue, sc->capacity.bsize); | |
1612 | set_capacity(disk, sc->capacity.nsec); | |
1613 | // set_disk_ro(sdkp->disk, sc->readonly); | |
1614 | ||
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | /* | |
1619 | * The check is called by the block layer to verify if the media | |
1620 | * is still available. It is supposed to be harmless, lightweight and | |
1621 | * non-intrusive in case the media was not changed. | |
1622 | * | |
1623 | * This call can sleep. | |
1624 | * | |
1625 | * The return code is bool! | |
1626 | */ | |
1627 | static int ub_bd_media_changed(struct gendisk *disk) | |
1628 | { | |
1629 | struct ub_dev *sc = disk->private_data; | |
1630 | ||
1631 | if (!sc->removable) | |
1632 | return 0; | |
1633 | ||
1634 | /* | |
1635 | * We clean checks always after every command, so this is not | |
1636 | * as dangerous as it looks. If the TEST_UNIT_READY fails here, | |
1637 | * the device is actually not ready with operator or software | |
1638 | * intervention required. One dangerous item might be a drive which | |
1639 | * spins itself down, and come the time to write dirty pages, this | |
1640 | * will fail, then block layer discards the data. Since we never | |
1641 | * spin drives up, such devices simply cannot be used with ub anyway. | |
1642 | */ | |
1643 | if (ub_sync_tur(sc) != 0) { | |
1644 | sc->changed = 1; | |
1645 | return 1; | |
1646 | } | |
1647 | ||
1648 | return sc->changed; | |
1649 | } | |
1650 | ||
1651 | static struct block_device_operations ub_bd_fops = { | |
1652 | .owner = THIS_MODULE, | |
1653 | .open = ub_bd_open, | |
1654 | .release = ub_bd_release, | |
1655 | .ioctl = ub_bd_ioctl, | |
1656 | .media_changed = ub_bd_media_changed, | |
1657 | .revalidate_disk = ub_bd_revalidate, | |
1658 | }; | |
1659 | ||
1660 | /* | |
1661 | * Common ->done routine for commands executed synchronously. | |
1662 | */ | |
1663 | static void ub_probe_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd) | |
1664 | { | |
1665 | struct completion *cop = cmd->back; | |
1666 | complete(cop); | |
1667 | } | |
1668 | ||
1669 | /* | |
1670 | * Test if the device has a check condition on it, synchronously. | |
1671 | */ | |
1672 | static int ub_sync_tur(struct ub_dev *sc) | |
1673 | { | |
1674 | struct ub_scsi_cmd *cmd; | |
1675 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) }; | |
1676 | unsigned long flags; | |
1677 | struct completion compl; | |
1678 | int rc; | |
1679 | ||
1680 | init_completion(&compl); | |
1681 | ||
1682 | rc = -ENOMEM; | |
1683 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
1684 | goto err_alloc; | |
1685 | memset(cmd, 0, ALLOC_SIZE); | |
1686 | ||
1687 | cmd->cdb[0] = TEST_UNIT_READY; | |
1688 | cmd->cdb_len = 6; | |
1689 | cmd->dir = UB_DIR_NONE; | |
1690 | cmd->state = UB_CMDST_INIT; | |
1691 | cmd->done = ub_probe_done; | |
1692 | cmd->back = &compl; | |
1693 | ||
1694 | spin_lock_irqsave(&sc->lock, flags); | |
1695 | cmd->tag = sc->tagcnt++; | |
1696 | ||
1697 | rc = ub_submit_scsi(sc, cmd); | |
1698 | spin_unlock_irqrestore(&sc->lock, flags); | |
1699 | ||
1700 | if (rc != 0) { | |
1701 | printk("ub: testing ready: submit error (%d)\n", rc); /* P3 */ | |
1702 | goto err_submit; | |
1703 | } | |
1704 | ||
1705 | wait_for_completion(&compl); | |
1706 | ||
1707 | rc = cmd->error; | |
1708 | ||
1709 | if (rc == -EIO && cmd->key != 0) /* Retries for benh's key */ | |
1710 | rc = cmd->key; | |
1711 | ||
1712 | err_submit: | |
1713 | kfree(cmd); | |
1714 | err_alloc: | |
1715 | return rc; | |
1716 | } | |
1717 | ||
1718 | /* | |
1719 | * Read the SCSI capacity synchronously (for probing). | |
1720 | */ | |
1721 | static int ub_sync_read_cap(struct ub_dev *sc, struct ub_capacity *ret) | |
1722 | { | |
1723 | struct ub_scsi_cmd *cmd; | |
1724 | char *p; | |
1725 | enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 }; | |
1726 | unsigned long flags; | |
1727 | unsigned int bsize, shift; | |
1728 | unsigned long nsec; | |
1729 | struct completion compl; | |
1730 | int rc; | |
1731 | ||
1732 | init_completion(&compl); | |
1733 | ||
1734 | rc = -ENOMEM; | |
1735 | if ((cmd = kmalloc(ALLOC_SIZE, GFP_KERNEL)) == NULL) | |
1736 | goto err_alloc; | |
1737 | memset(cmd, 0, ALLOC_SIZE); | |
1738 | p = (char *)cmd + sizeof(struct ub_scsi_cmd); | |
1739 | ||
1740 | cmd->cdb[0] = 0x25; | |
1741 | cmd->cdb_len = 10; | |
1742 | cmd->dir = UB_DIR_READ; | |
1743 | cmd->state = UB_CMDST_INIT; | |
1744 | cmd->data = p; | |
1745 | cmd->len = 8; | |
1746 | cmd->done = ub_probe_done; | |
1747 | cmd->back = &compl; | |
1748 | ||
1749 | spin_lock_irqsave(&sc->lock, flags); | |
1750 | cmd->tag = sc->tagcnt++; | |
1751 | ||
1752 | rc = ub_submit_scsi(sc, cmd); | |
1753 | spin_unlock_irqrestore(&sc->lock, flags); | |
1754 | ||
1755 | if (rc != 0) { | |
1756 | printk("ub: reading capacity: submit error (%d)\n", rc); /* P3 */ | |
1757 | goto err_submit; | |
1758 | } | |
1759 | ||
1760 | wait_for_completion(&compl); | |
1761 | ||
1762 | if (cmd->error != 0) { | |
1763 | printk("ub: reading capacity: error %d\n", cmd->error); /* P3 */ | |
1764 | rc = -EIO; | |
1765 | goto err_read; | |
1766 | } | |
1767 | if (cmd->act_len != 8) { | |
1768 | printk("ub: reading capacity: size %d\n", cmd->act_len); /* P3 */ | |
1769 | rc = -EIO; | |
1770 | goto err_read; | |
1771 | } | |
1772 | ||
1773 | /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */ | |
1774 | nsec = be32_to_cpu(*(__be32 *)p) + 1; | |
1775 | bsize = be32_to_cpu(*(__be32 *)(p + 4)); | |
1776 | switch (bsize) { | |
1777 | case 512: shift = 0; break; | |
1778 | case 1024: shift = 1; break; | |
1779 | case 2048: shift = 2; break; | |
1780 | case 4096: shift = 3; break; | |
1781 | default: | |
1782 | printk("ub: Bad sector size %u\n", bsize); /* P3 */ | |
1783 | rc = -EDOM; | |
1784 | goto err_inv_bsize; | |
1785 | } | |
1786 | ||
1787 | ret->bsize = bsize; | |
1788 | ret->bshift = shift; | |
1789 | ret->nsec = nsec << shift; | |
1790 | rc = 0; | |
1791 | ||
1792 | err_inv_bsize: | |
1793 | err_read: | |
1794 | err_submit: | |
1795 | kfree(cmd); | |
1796 | err_alloc: | |
1797 | return rc; | |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | */ | |
1802 | static void ub_probe_urb_complete(struct urb *urb, struct pt_regs *pt) | |
1803 | { | |
1804 | struct completion *cop = urb->context; | |
1805 | complete(cop); | |
1806 | } | |
1807 | ||
1808 | static void ub_probe_timeout(unsigned long arg) | |
1809 | { | |
1810 | struct completion *cop = (struct completion *) arg; | |
1811 | complete(cop); | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * Clear initial stalls. | |
1816 | */ | |
1817 | static int ub_probe_clear_stall(struct ub_dev *sc, int stalled_pipe) | |
1818 | { | |
1819 | int endp; | |
1820 | struct usb_ctrlrequest *cr; | |
1821 | struct completion compl; | |
1822 | struct timer_list timer; | |
1823 | int rc; | |
1824 | ||
1825 | init_completion(&compl); | |
1826 | ||
1827 | endp = usb_pipeendpoint(stalled_pipe); | |
1828 | if (usb_pipein (stalled_pipe)) | |
1829 | endp |= USB_DIR_IN; | |
1830 | ||
1831 | cr = &sc->work_cr; | |
1832 | cr->bRequestType = USB_RECIP_ENDPOINT; | |
1833 | cr->bRequest = USB_REQ_CLEAR_FEATURE; | |
1834 | cr->wValue = cpu_to_le16(USB_ENDPOINT_HALT); | |
1835 | cr->wIndex = cpu_to_le16(endp); | |
1836 | cr->wLength = cpu_to_le16(0); | |
1837 | ||
1838 | usb_fill_control_urb(&sc->work_urb, sc->dev, sc->send_ctrl_pipe, | |
1839 | (unsigned char*) cr, NULL, 0, ub_probe_urb_complete, &compl); | |
1840 | sc->work_urb.transfer_flags = 0; | |
1841 | sc->work_urb.actual_length = 0; | |
1842 | sc->work_urb.error_count = 0; | |
1843 | sc->work_urb.status = 0; | |
1844 | ||
1845 | if ((rc = usb_submit_urb(&sc->work_urb, GFP_KERNEL)) != 0) { | |
1846 | printk(KERN_WARNING | |
1847 | "%s: Unable to submit a probe clear (%d)\n", sc->name, rc); | |
1848 | return rc; | |
1849 | } | |
1850 | ||
1851 | init_timer(&timer); | |
1852 | timer.function = ub_probe_timeout; | |
1853 | timer.data = (unsigned long) &compl; | |
1854 | timer.expires = jiffies + UB_CTRL_TIMEOUT; | |
1855 | add_timer(&timer); | |
1856 | ||
1857 | wait_for_completion(&compl); | |
1858 | ||
1859 | del_timer_sync(&timer); | |
1860 | usb_kill_urb(&sc->work_urb); | |
1861 | ||
1862 | /* reset the endpoint toggle */ | |
1863 | usb_settoggle(sc->dev, endp, usb_pipeout(sc->last_pipe), 0); | |
1864 | ||
1865 | return 0; | |
1866 | } | |
1867 | ||
1868 | /* | |
1869 | * Get the pipe settings. | |
1870 | */ | |
1871 | static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev, | |
1872 | struct usb_interface *intf) | |
1873 | { | |
1874 | struct usb_host_interface *altsetting = intf->cur_altsetting; | |
1875 | struct usb_endpoint_descriptor *ep_in = NULL; | |
1876 | struct usb_endpoint_descriptor *ep_out = NULL; | |
1877 | struct usb_endpoint_descriptor *ep; | |
1878 | int i; | |
1879 | ||
1880 | /* | |
1881 | * Find the endpoints we need. | |
1882 | * We are expecting a minimum of 2 endpoints - in and out (bulk). | |
1883 | * We will ignore any others. | |
1884 | */ | |
1885 | for (i = 0; i < altsetting->desc.bNumEndpoints; i++) { | |
1886 | ep = &altsetting->endpoint[i].desc; | |
1887 | ||
1888 | /* Is it a BULK endpoint? */ | |
1889 | if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) | |
1890 | == USB_ENDPOINT_XFER_BULK) { | |
1891 | /* BULK in or out? */ | |
1892 | if (ep->bEndpointAddress & USB_DIR_IN) | |
1893 | ep_in = ep; | |
1894 | else | |
1895 | ep_out = ep; | |
1896 | } | |
1897 | } | |
1898 | ||
1899 | if (ep_in == NULL || ep_out == NULL) { | |
1900 | printk(KERN_NOTICE "%s: device %u failed endpoint check\n", | |
1901 | sc->name, sc->dev->devnum); | |
1902 | return -EIO; | |
1903 | } | |
1904 | ||
1905 | /* Calculate and store the pipe values */ | |
1906 | sc->send_ctrl_pipe = usb_sndctrlpipe(dev, 0); | |
1907 | sc->recv_ctrl_pipe = usb_rcvctrlpipe(dev, 0); | |
1908 | sc->send_bulk_pipe = usb_sndbulkpipe(dev, | |
1909 | ep_out->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
1910 | sc->recv_bulk_pipe = usb_rcvbulkpipe(dev, | |
1911 | ep_in->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
1912 | ||
1913 | return 0; | |
1914 | } | |
1915 | ||
1916 | /* | |
1917 | * Probing is done in the process context, which allows us to cheat | |
1918 | * and not to build a state machine for the discovery. | |
1919 | */ | |
1920 | static int ub_probe(struct usb_interface *intf, | |
1921 | const struct usb_device_id *dev_id) | |
1922 | { | |
1923 | struct ub_dev *sc; | |
1924 | request_queue_t *q; | |
1925 | struct gendisk *disk; | |
1926 | int rc; | |
1927 | int i; | |
1928 | ||
1929 | rc = -ENOMEM; | |
1930 | if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL) | |
1931 | goto err_core; | |
1932 | memset(sc, 0, sizeof(struct ub_dev)); | |
1933 | spin_lock_init(&sc->lock); | |
1934 | usb_init_urb(&sc->work_urb); | |
1935 | tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc); | |
1936 | atomic_set(&sc->poison, 0); | |
1937 | ||
1938 | init_timer(&sc->work_timer); | |
1939 | sc->work_timer.data = (unsigned long) sc; | |
1940 | sc->work_timer.function = ub_urb_timeout; | |
1941 | ||
1942 | ub_init_completion(&sc->work_done); | |
1943 | sc->work_done.done = 1; /* A little yuk, but oh well... */ | |
1944 | ||
1945 | rc = -ENOSR; | |
1946 | if ((sc->id = ub_id_get()) == -1) | |
1947 | goto err_id; | |
1948 | snprintf(sc->name, 8, DRV_NAME "%c", sc->id + 'a'); | |
1949 | ||
1950 | sc->dev = interface_to_usbdev(intf); | |
1951 | sc->intf = intf; | |
1952 | // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; | |
1953 | ||
1954 | usb_set_intfdata(intf, sc); | |
1955 | usb_get_dev(sc->dev); | |
1956 | // usb_get_intf(sc->intf); /* Do we need this? */ | |
1957 | ||
1958 | /* XXX Verify that we can handle the device (from descriptors) */ | |
1959 | ||
1960 | ub_get_pipes(sc, sc->dev, intf); | |
1961 | ||
1962 | if (device_create_file(&sc->intf->dev, &dev_attr_diag) != 0) | |
1963 | goto err_diag; | |
1964 | ||
1965 | /* | |
1966 | * At this point, all USB initialization is done, do upper layer. | |
1967 | * We really hate halfway initialized structures, so from the | |
1968 | * invariants perspective, this ub_dev is fully constructed at | |
1969 | * this point. | |
1970 | */ | |
1971 | ||
1972 | /* | |
1973 | * This is needed to clear toggles. It is a problem only if we do | |
1974 | * `rmmod ub && modprobe ub` without disconnects, but we like that. | |
1975 | */ | |
1976 | ub_probe_clear_stall(sc, sc->recv_bulk_pipe); | |
1977 | ub_probe_clear_stall(sc, sc->send_bulk_pipe); | |
1978 | ||
1979 | /* | |
1980 | * The way this is used by the startup code is a little specific. | |
1981 | * A SCSI check causes a USB stall. Our common case code sees it | |
1982 | * and clears the check, after which the device is ready for use. | |
1983 | * But if a check was not present, any command other than | |
1984 | * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE). | |
1985 | * | |
1986 | * If we neglect to clear the SCSI check, the first real command fails | |
1987 | * (which is the capacity readout). We clear that and retry, but why | |
1988 | * causing spurious retries for no reason. | |
1989 | * | |
1990 | * Revalidation may start with its own TEST_UNIT_READY, but that one | |
1991 | * has to succeed, so we clear checks with an additional one here. | |
1992 | * In any case it's not our business how revaliadation is implemented. | |
1993 | */ | |
1994 | for (i = 0; i < 3; i++) { /* Retries for benh's key */ | |
1995 | if ((rc = ub_sync_tur(sc)) <= 0) break; | |
1996 | if (rc != 0x6) break; | |
1997 | msleep(10); | |
1998 | } | |
1999 | ||
2000 | sc->removable = 1; /* XXX Query this from the device */ | |
2001 | sc->changed = 1; /* ub_revalidate clears only */ | |
2002 | sc->first_open = 1; | |
2003 | ||
2004 | ub_revalidate(sc); | |
2005 | /* This is pretty much a long term P3 */ | |
2006 | printk(KERN_INFO "%s: device %u capacity nsec %ld bsize %u\n", | |
2007 | sc->name, sc->dev->devnum, sc->capacity.nsec, sc->capacity.bsize); | |
2008 | ||
2009 | /* | |
2010 | * Just one disk per sc currently, but maybe more. | |
2011 | */ | |
2012 | rc = -ENOMEM; | |
2013 | if ((disk = alloc_disk(UB_MINORS_PER_MAJOR)) == NULL) | |
2014 | goto err_diskalloc; | |
2015 | ||
2016 | sc->disk = disk; | |
2017 | sprintf(disk->disk_name, DRV_NAME "%c", sc->id + 'a'); | |
2018 | sprintf(disk->devfs_name, DEVFS_NAME "/%c", sc->id + 'a'); | |
2019 | disk->major = UB_MAJOR; | |
2020 | disk->first_minor = sc->id * UB_MINORS_PER_MAJOR; | |
2021 | disk->fops = &ub_bd_fops; | |
2022 | disk->private_data = sc; | |
2023 | disk->driverfs_dev = &intf->dev; | |
2024 | ||
2025 | rc = -ENOMEM; | |
2026 | if ((q = blk_init_queue(ub_bd_rq_fn, &sc->lock)) == NULL) | |
2027 | goto err_blkqinit; | |
2028 | ||
2029 | disk->queue = q; | |
2030 | ||
2031 | // blk_queue_bounce_limit(q, hba[i]->pdev->dma_mask); | |
2032 | blk_queue_max_hw_segments(q, UB_MAX_REQ_SG); | |
2033 | blk_queue_max_phys_segments(q, UB_MAX_REQ_SG); | |
2034 | // blk_queue_segment_boundary(q, CARM_SG_BOUNDARY); | |
2035 | blk_queue_max_sectors(q, UB_MAX_SECTORS); | |
2036 | blk_queue_hardsect_size(q, sc->capacity.bsize); | |
2037 | ||
2038 | /* | |
2039 | * This is a serious infraction, caused by a deficiency in the | |
2040 | * USB sg interface (usb_sg_wait()). We plan to remove this once | |
2041 | * we get mileage on the driver and can justify a change to USB API. | |
2042 | * See blk_queue_bounce_limit() to understand this part. | |
2043 | * | |
2044 | * XXX And I still need to be aware of the DMA mask in the HC. | |
2045 | */ | |
2046 | q->bounce_pfn = blk_max_low_pfn; | |
2047 | q->bounce_gfp = GFP_NOIO; | |
2048 | ||
2049 | q->queuedata = sc; | |
2050 | ||
2051 | set_capacity(disk, sc->capacity.nsec); | |
2052 | if (sc->removable) | |
2053 | disk->flags |= GENHD_FL_REMOVABLE; | |
2054 | ||
2055 | add_disk(disk); | |
2056 | ||
2057 | return 0; | |
2058 | ||
2059 | err_blkqinit: | |
2060 | put_disk(disk); | |
2061 | err_diskalloc: | |
2062 | device_remove_file(&sc->intf->dev, &dev_attr_diag); | |
2063 | err_diag: | |
2064 | usb_set_intfdata(intf, NULL); | |
2065 | // usb_put_intf(sc->intf); | |
2066 | usb_put_dev(sc->dev); | |
2067 | ub_id_put(sc->id); | |
2068 | err_id: | |
2069 | kfree(sc); | |
2070 | err_core: | |
2071 | return rc; | |
2072 | } | |
2073 | ||
2074 | static void ub_disconnect(struct usb_interface *intf) | |
2075 | { | |
2076 | struct ub_dev *sc = usb_get_intfdata(intf); | |
2077 | struct gendisk *disk = sc->disk; | |
2078 | unsigned long flags; | |
2079 | ||
2080 | /* | |
2081 | * Prevent ub_bd_release from pulling the rug from under us. | |
2082 | * XXX This is starting to look like a kref. | |
2083 | * XXX Why not to take this ref at probe time? | |
2084 | */ | |
2085 | spin_lock_irqsave(&ub_lock, flags); | |
2086 | sc->openc++; | |
2087 | spin_unlock_irqrestore(&ub_lock, flags); | |
2088 | ||
2089 | /* | |
2090 | * Fence stall clearnings, operations triggered by unlinkings and so on. | |
2091 | * We do not attempt to unlink any URBs, because we do not trust the | |
2092 | * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway. | |
2093 | */ | |
2094 | atomic_set(&sc->poison, 1); | |
2095 | ||
2096 | /* | |
2097 | * Blow away queued commands. | |
2098 | * | |
2099 | * Actually, this never works, because before we get here | |
2100 | * the HCD terminates outstanding URB(s). It causes our | |
2101 | * SCSI command queue to advance, commands fail to submit, | |
2102 | * and the whole queue drains. So, we just use this code to | |
2103 | * print warnings. | |
2104 | */ | |
2105 | spin_lock_irqsave(&sc->lock, flags); | |
2106 | { | |
2107 | struct ub_scsi_cmd *cmd; | |
2108 | int cnt = 0; | |
2109 | while ((cmd = ub_cmdq_pop(sc)) != NULL) { | |
2110 | cmd->error = -ENOTCONN; | |
2111 | cmd->state = UB_CMDST_DONE; | |
2112 | ub_cmdtr_state(sc, cmd); | |
2113 | ub_cmdq_pop(sc); | |
2114 | (*cmd->done)(sc, cmd); | |
2115 | cnt++; | |
2116 | } | |
2117 | if (cnt != 0) { | |
2118 | printk(KERN_WARNING "%s: " | |
2119 | "%d was queued after shutdown\n", sc->name, cnt); | |
2120 | } | |
2121 | } | |
2122 | spin_unlock_irqrestore(&sc->lock, flags); | |
2123 | ||
2124 | /* | |
2125 | * Unregister the upper layer. | |
2126 | */ | |
2127 | if (disk->flags & GENHD_FL_UP) | |
2128 | del_gendisk(disk); | |
2129 | /* | |
2130 | * I wish I could do: | |
2131 | * set_bit(QUEUE_FLAG_DEAD, &q->queue_flags); | |
2132 | * As it is, we rely on our internal poisoning and let | |
2133 | * the upper levels to spin furiously failing all the I/O. | |
2134 | */ | |
2135 | ||
2136 | /* | |
2137 | * Taking a lock on a structure which is about to be freed | |
2138 | * is very nonsensual. Here it is largely a way to do a debug freeze, | |
2139 | * and a bracket which shows where the nonsensual code segment ends. | |
2140 | * | |
2141 | * Testing for -EINPROGRESS is always a bug, so we are bending | |
2142 | * the rules a little. | |
2143 | */ | |
2144 | spin_lock_irqsave(&sc->lock, flags); | |
2145 | if (sc->work_urb.status == -EINPROGRESS) { /* janitors: ignore */ | |
2146 | printk(KERN_WARNING "%s: " | |
2147 | "URB is active after disconnect\n", sc->name); | |
2148 | } | |
2149 | spin_unlock_irqrestore(&sc->lock, flags); | |
2150 | ||
2151 | /* | |
2152 | * There is virtually no chance that other CPU runs times so long | |
2153 | * after ub_urb_complete should have called del_timer, but only if HCD | |
2154 | * didn't forget to deliver a callback on unlink. | |
2155 | */ | |
2156 | del_timer_sync(&sc->work_timer); | |
2157 | ||
2158 | /* | |
2159 | * At this point there must be no commands coming from anyone | |
2160 | * and no URBs left in transit. | |
2161 | */ | |
2162 | ||
2163 | device_remove_file(&sc->intf->dev, &dev_attr_diag); | |
2164 | usb_set_intfdata(intf, NULL); | |
2165 | // usb_put_intf(sc->intf); | |
2166 | sc->intf = NULL; | |
2167 | usb_put_dev(sc->dev); | |
2168 | sc->dev = NULL; | |
2169 | ||
2170 | ub_put(sc); | |
2171 | } | |
2172 | ||
2173 | static struct usb_driver ub_driver = { | |
2174 | .owner = THIS_MODULE, | |
2175 | .name = "ub", | |
2176 | .probe = ub_probe, | |
2177 | .disconnect = ub_disconnect, | |
2178 | .id_table = ub_usb_ids, | |
2179 | }; | |
2180 | ||
2181 | static int __init ub_init(void) | |
2182 | { | |
2183 | int rc; | |
2184 | ||
2185 | /* P3 */ printk("ub: sizeof ub_scsi_cmd %zu ub_dev %zu\n", | |
2186 | sizeof(struct ub_scsi_cmd), sizeof(struct ub_dev)); | |
2187 | ||
2188 | if ((rc = register_blkdev(UB_MAJOR, DRV_NAME)) != 0) | |
2189 | goto err_regblkdev; | |
2190 | devfs_mk_dir(DEVFS_NAME); | |
2191 | ||
2192 | if ((rc = usb_register(&ub_driver)) != 0) | |
2193 | goto err_register; | |
2194 | ||
2195 | return 0; | |
2196 | ||
2197 | err_register: | |
2198 | devfs_remove(DEVFS_NAME); | |
2199 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
2200 | err_regblkdev: | |
2201 | return rc; | |
2202 | } | |
2203 | ||
2204 | static void __exit ub_exit(void) | |
2205 | { | |
2206 | usb_deregister(&ub_driver); | |
2207 | ||
2208 | devfs_remove(DEVFS_NAME); | |
2209 | unregister_blkdev(UB_MAJOR, DRV_NAME); | |
2210 | } | |
2211 | ||
2212 | module_init(ub_init); | |
2213 | module_exit(ub_exit); | |
2214 | ||
2215 | MODULE_LICENSE("GPL"); |