diff options
| -rw-r--r-- | block/genhd.c | 8 | ||||
| -rw-r--r-- | fs/block_dev.c | 13 |
2 files changed, 16 insertions, 5 deletions
diff --git a/block/genhd.c b/block/genhd.c index 3608289c8ec..8c0829a3637 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -611,6 +611,12 @@ void add_disk(struct gendisk *disk) register_disk(disk); blk_register_queue(disk); + /* + * Take an extra ref on queue which will be put on disk_release() + * so that it sticks around as long as @disk is there. + */ + WARN_ON_ONCE(blk_get_queue(disk->queue)); + retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, "bdi"); WARN_ON(retval); @@ -1103,6 +1109,8 @@ static void disk_release(struct device *dev) disk_replace_part_tbl(disk, NULL); free_part_stats(&disk->part0); free_part_info(&disk->part0); + if (disk->queue) + blk_put_queue(disk->queue); kfree(disk); } struct class block_class = { diff --git a/fs/block_dev.c b/fs/block_dev.c index 194cf66bc8f..34503ba6c07 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1075,6 +1075,7 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) { struct gendisk *disk; + struct module *owner; int ret; int partno; int perm = 0; @@ -1100,6 +1101,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) disk = get_gendisk(bdev->bd_dev, &partno); if (!disk) goto out; + owner = disk->fops->owner; disk_block_events(disk); mutex_lock_nested(&bdev->bd_mutex, for_part); @@ -1127,8 +1129,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) bdev->bd_disk = NULL; mutex_unlock(&bdev->bd_mutex); disk_unblock_events(disk); - module_put(disk->fops->owner); put_disk(disk); + module_put(owner); goto restart; } } @@ -1184,8 +1186,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) goto out_unlock_bdev; } /* only one opener holds refs to the module and disk */ - module_put(disk->fops->owner); put_disk(disk); + module_put(owner); } bdev->bd_openers++; if (for_part) @@ -1205,8 +1207,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) out_unlock_bdev: mutex_unlock(&bdev->bd_mutex); disk_unblock_events(disk); - module_put(disk->fops->owner); put_disk(disk); + module_put(owner); out: bdput(bdev); @@ -1432,14 +1434,15 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) if (!bdev->bd_openers) { struct module *owner = disk->fops->owner; - put_disk(disk); - module_put(owner); disk_put_part(bdev->bd_part); bdev->bd_part = NULL; bdev->bd_disk = NULL; if (bdev != bdev->bd_contains) victim = bdev->bd_contains; bdev->bd_contains = NULL; + + put_disk(disk); + module_put(owner); } mutex_unlock(&bdev->bd_mutex); bdput(bdev); |