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>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 0770004..0939f36 100644 (file)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -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;
        }