2 files changed, 12 insertions, 11 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;
 }
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 43cf9cc9c1df..f38f939e94c3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -36,7 +36,7 @@
 #include <linux/blkdev.h>
 #include <linux/sysctl.h>
 #include <linux/seq_file.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/buffer_head.h> /* for invalidate_bdev */
 #include <linux/poll.h>
 #include <linux/ctype.h>
@@ -57,6 +57,7 @@
 #define DEBUG 0
 #define dprintk(x...) ((void)(DEBUG && printk(x)))
 
+static DEFINE_MUTEX(md_mutex);
 
 #ifndef MODULE
 static void autostart_arrays(int part);
@@ -5949,7 +5950,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
         mddev_t *mddev = mddev_find(bdev->bd_dev);
         int err;
 
-        lock_kernel();
+        mutex_lock(&md_mutex);
         if (mddev->gendisk != bdev->bd_disk) {
                 /* we are racing with mddev_put which is discarding this
                  * bd_disk.
@@ -5958,7 +5959,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
                 /* Wait until bdev->bd_disk is definitely gone */
                 flush_scheduled_work();
                 /* Then retry the open from the top */
-                unlock_kernel();
+                mutex_unlock(&md_mutex);
                 return -ERESTARTSYS;
         }
         BUG_ON(mddev != bdev->bd_disk->private_data);
@@ -5972,7 +5973,7 @@ static int md_open(struct block_device *bdev, fmode_t mode)
 
         check_disk_size_change(mddev->gendisk, bdev);
  out:
-        unlock_kernel();
+        mutex_unlock(&md_mutex);
         return err;
 }
 
@@ -5981,10 +5982,10 @@ static int md_release(struct gendisk *disk, fmode_t mode)
         mddev_t *mddev = disk->private_data;
 
         BUG_ON(!mddev);
-        lock_kernel();
+        mutex_lock(&md_mutex);
         atomic_dec(&mddev->openers);
         mddev_put(mddev);
-        unlock_kernel();
+        mutex_unlock(&md_mutex);
 
         return 0;
 }