md: make devices disappear when they are no longer needed.

[linux-2.6-omap-h63xx.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index b957717e25abbbe2dc16aa655084d0f779f6c5c6..8ebbfdf708c24c9d70bc4cc88e8266202d56ec06 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1005,6 +1005,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
        }
 
        lock_kernel();
+ restart:
 
        ret = -ENXIO;
        disk = get_gendisk(bdev->bd_dev, &partno);
@@ -1025,6 +1026,19 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
 
                        if (disk->fops->open) {
                                ret = disk->fops->open(bdev, mode);
+                               if (ret == -ERESTARTSYS) {
+                                       /* Lost a race with 'disk' being
+                                        * deleted, try again.
+                                        * See md.c
+                                        */
+                                       disk_put_part(bdev->bd_part);
+                                       bdev->bd_part = NULL;
+                                       module_put(disk->fops->owner);
+                                       put_disk(disk);
+                                       bdev->bd_disk = NULL;
+                                       mutex_unlock(&bdev->bd_mutex);
+                                       goto restart;
+                               }
                                if (ret)
                                        goto out_clear;
                        }