Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / md / md.c

diff --git a/drivers/md/md.c b/drivers/md/md.c
index ed075d1..2258151 100644 (file)
--- 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);
@@ -5884,7 +5885,7 @@ 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.
@@ -5893,7 +5894,7 @@ 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);
@@ -5907,7 +5908,7 @@ 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;
 }
 
@@ -5916,10 +5917,10 @@ 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;
 }