UBI: introduce flash dump helper

[net-next-2.6.git] / drivers / mtd / ubi / debug.c

diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index 54b0186915fbf6ab6be8f845a4d942f7f2f277aa..4876977e52cbc90446bb45050ce5e1a2ce18cfab 100644 (file)
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -196,4 +196,36 @@ void ubi_dbg_dump_mkvol_req(const struct ubi_mkvol_req *req)
        printk(KERN_DEBUG "\t1st 16 characters of name: %s\n", nm);
 }
 
+/**
+ * ubi_dbg_dump_flash - dump a region of flash.
+ * @ubi: UBI device description object
+ * @pnum: the physical eraseblock number to dump
+ * @offset: the starting offset within the physical eraseblock to dump
+ * @len: the length of the region to dump
+ */
+void ubi_dbg_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len)
+{
+       int err;
+       size_t read;
+       void *buf;
+       loff_t addr = (loff_t)pnum * ubi->peb_size + offset;
+
+       buf = vmalloc(len);
+       if (!buf)
+               return;
+       err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf);
+       if (err && err != -EUCLEAN) {
+               ubi_err("error %d while reading %d bytes from PEB %d:%d, "
+                       "read %zd bytes", err, len, pnum, offset, read);
+               goto out;
+       }
+
+       dbg_msg("dumping %d bytes of data from PEB %d, offset %d",
+               len, pnum, offset);
+       print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
+out:
+       vfree(buf);
+       return;
+}
+
 #endif /* CONFIG_MTD_UBI_DEBUG */