--- fs/block_dev.c

+++ fs/block_dev.c

@@ -1175,10 +1175,12 @@ static int __blkdev_get(struct block_dev

/*

* hooks: /n/, see "layering violations".

*/

- ret = devcgroup_inode_permission(bdev->bd_inode, perm);

- if (ret != 0) {

- bdput(bdev);

- return ret;

+ if (!for_part) {

+ ret = devcgroup_inode_permission(bdev->bd_inode, perm);

+ if (ret != 0) {

+ bdput(bdev);

+ return ret;

+ }

}

lock_kernel();