procfs: Push down the bkl from ioctl

Push down the bkl from procfs's ioctl main handler to its users.
Only three procfs users implement an ioctl (non unlocked) handler.
Turn them into unlocked_ioctl and push down the Devil inside.

v2: PDE(inode)->data doesn't need to be under bkl
v3: And don't forget to git-add the result
v4: Use wrappers to pushdown instead of an invasive and error prone
    handlers surgery.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: John Kacur <jkacur@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index fc8cf7ac7f2bd5a09a176755dbe90f33deca744d..4cd8b227c11f378336d46601318eae5471f6ec66 100644 (file)
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -23,6 +23,7 @@
 #include <linux/seq_file.h>
 #include <linux/dmi.h>
 #include <linux/capability.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 
@@ -82,8 +83,7 @@ module_param(fan_mult, int, 0);
 MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");
 
 static int i8k_open_fs(struct inode *inode, struct file *file);
-static int i8k_ioctl(struct inode *, struct file *, unsigned int,
-                    unsigned long);
+static long i8k_ioctl(struct file *, unsigned int, unsigned long);
 
 static const struct file_operations i8k_fops = {
        .owner          = THIS_MODULE,
@@ -91,7 +91,7 @@ static const struct file_operations i8k_fops = {
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
-       .ioctl          = i8k_ioctl,
+       .unlocked_ioctl = i8k_ioctl,
 };
 
 struct smm_regs {
@@ -307,8 +307,8 @@ static int i8k_get_dell_signature(int req_fn)
        return regs.eax == 1145651527 && regs.edx == 1145392204 ? 0 : -1;
 }
 
-static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
-                    unsigned long arg)
+static int
+i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
 {
        int val = 0;
        int speed;
@@ -395,6 +395,17 @@ static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
        return 0;
 }
 
+static long i8k_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
+{
+       long ret;
+
+       lock_kernel();
+       ret = i8k_ioctl_unlocked(fp, cmd, arg);
+       unlock_kernel();
+
+       return ret;
+}
+
 /*
  * Print the information for /proc/i8k.
  */

diff --git a/drivers/isdn/divert/divert_procfs.c b/drivers/isdn/divert/divert_procfs.c
index 3697c409bec66d5b9c2dbe0b31577f22fef2ef1c..724693c4d975e8a41deab965a83a39e213252790 100644 (file)
--- a/drivers/isdn/divert/divert_procfs.c
+++ b/drivers/isdn/divert/divert_procfs.c
@@ -19,6 +19,7 @@
 #include <linux/sched.h>
 #include <linux/isdnif.h>
 #include <net/net_namespace.h>
+#include <linux/smp_lock.h>
 #include "isdn_divert.h"
 
 
@@ -176,9 +177,7 @@ isdn_divert_close(struct inode *ino, struct file *filep)
 /*********/
 /* IOCTL */
 /*********/
-static int
-isdn_divert_ioctl(struct inode *inode, struct file *file,
-                 uint cmd, ulong arg)
+static int isdn_divert_ioctl_unlocked(struct file *file, uint cmd, ulong arg)
 {
        divert_ioctl dioctl;
        int i;
@@ -257,6 +256,17 @@ isdn_divert_ioctl(struct inode *inode, struct file *file,
        return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
 }                              /* isdn_divert_ioctl */
 
+static long isdn_divert_ioctl(struct file *file, uint cmd, ulong arg)
+{
+       long ret;
+
+       lock_kernel();
+       ret = isdn_divert_ioctl_unlocked(file, cmd, arg);
+       unlock_kernel();
+
+       return ret;
+}
+
 static const struct file_operations isdn_fops =
 {
        .owner          = THIS_MODULE,
@@ -264,7 +274,7 @@ static const struct file_operations isdn_fops =
        .read           = isdn_divert_read,
        .write          = isdn_divert_write,
        .poll           = isdn_divert_poll,
-       .ioctl          = isdn_divert_ioctl,
+       .unlocked_ioctl = isdn_divert_ioctl,
        .open           = isdn_divert_open,
        .release        = isdn_divert_close,                                      
 };

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 39bddba53ba10cdd15057ffc29bfa2cc385eecce..95690a8a4d805f782d24d51527467603ccbdbf76 100644 (file)
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1331,12 +1331,18 @@ static unsigned int cache_poll_procfs(struct file *filp, poll_table *wait)
        return cache_poll(filp, wait, cd);
 }
 
-static int cache_ioctl_procfs(struct inode *inode, struct file *filp,
-                             unsigned int cmd, unsigned long arg)
+static long cache_ioctl_procfs(struct file *filp,
+                              unsigned int cmd, unsigned long arg)
 {
+       long ret;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        struct cache_detail *cd = PDE(inode)->data;
 
-       return cache_ioctl(inode, filp, cmd, arg, cd);
+       lock_kernel();
+       ret = cache_ioctl(inode, filp, cmd, arg, cd);
+       unlock_kernel();
+
+       return ret;
 }
 
 static int cache_open_procfs(struct inode *inode, struct file *filp)
@@ -1359,7 +1365,7 @@ static const struct file_operations cache_file_operations_procfs = {
        .read           = cache_read_procfs,
        .write          = cache_write_procfs,
        .poll           = cache_poll_procfs,
-       .ioctl          = cache_ioctl_procfs, /* for FIONREAD */
+       .unlocked_ioctl = cache_ioctl_procfs, /* for FIONREAD */
        .open           = cache_open_procfs,
        .release        = cache_release_procfs,
 };