diff options
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index d285a5481965..f3c636d23718 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -67,6 +67,7 @@ #include <linux/compat.h> #include <linux/suspend.h> #include <linux/freezer.h> +#include <linux/smp_lock.h> #include <linux/writeback.h> #include <linux/buffer_head.h> /* for invalidate_bdev() */ #include <linux/completion.h> @@ -1408,9 +1409,11 @@ static int lo_open(struct block_device *bdev, fmode_t mode) { struct loop_device *lo = bdev->bd_disk->private_data; + lock_kernel(); mutex_lock(&lo->lo_ctl_mutex); lo->lo_refcnt++; mutex_unlock(&lo->lo_ctl_mutex); + unlock_kernel(); return 0; } @@ -1420,6 +1423,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode) struct loop_device *lo = disk->private_data; int err; + lock_kernel(); mutex_lock(&lo->lo_ctl_mutex); if (--lo->lo_refcnt) @@ -1444,6 +1448,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode) out: mutex_unlock(&lo->lo_ctl_mutex); out_unlocked: + lock_kernel(); return 0; } |