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block: loop: check error using IS_ERR instead of IS_ERR_OR_NULL in loop_add() 

blk_mq_init_queue() will not return NULL pointer to its caller,
so it's better to replace IS_ERR_OR_NULL using IS_ERR in loop_add().

If in the future things change to check NULL pointer inside loop_add(),
we should return -ENOMEM as return code instead of PTR_ERR(NULL).

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Chengguang Xu 2018-12-16 17:35:00 +08:00 committed by Jens Axboe
parent e7cc005fef
commit 38a3499f6d
1 changed files with 1 additions and 1 deletions
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2
drivers/block/loop.c
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@ -1915,7 +1915,7 @@ static int loop_add(struct loop_device **l, int i)
goto out_free_idr;
lo->lo_queue = blk_mq_init_queue(&lo->tag_set);
if (IS_ERR_OR_NULL(lo->lo_queue)) {
if (IS_ERR(lo->lo_queue)) {
err = PTR_ERR(lo->lo_queue);
goto out_cleanup_tags;
}