1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ac384b2a6a33..7967eca5a2d5 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -15,7 +15,6 @@
 #include <linux/blkpg.h>
 #include <linux/bio.h>
 #include <linux/buffer_head.h>
-#include <linux/smp_lock.h>
 #include <linux/mempool.h>
 #include <linux/slab.h>
 #include <linux/idr.h>
@@ -33,6 +32,7 @@
 #define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE"
 #define DM_COOKIE_LENGTH 24
 
+static DEFINE_MUTEX(dm_mutex);
 static const char *_name = DM_NAME;
 
 static unsigned int major = 0;
@@ -344,7 +344,7 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 {
         struct mapped_device *md;
 
-        lock_kernel();
+        mutex_lock(&dm_mutex);
         spin_lock(&_minor_lock);
 
         md = bdev->bd_disk->private_data;
@@ -362,7 +362,7 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
 
 out:
         spin_unlock(&_minor_lock);
-        unlock_kernel();
+        mutex_unlock(&dm_mutex);
 
         return md ? 0 : -ENXIO;
 }
@@ -371,10 +371,10 @@ static int dm_blk_close(struct gendisk *disk, fmode_t mode)
 {
         struct mapped_device *md = disk->private_data;
 
-        lock_kernel();
+        mutex_lock(&dm_mutex);
         atomic_dec(&md->open_count);
         dm_put(md);
-        unlock_kernel();
+        mutex_unlock(&dm_mutex);
 
         return 0;
 }