blk-mq: fix an IS_ERR() vs NULL bug
The __blk_mq_alloc_disk() function doesn't return NULLs it returns
error pointers.
Fixes: b461dfc49eb6 ("blk-mq: add the blk_mq_alloc_disk APIs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/YMyjci35WBqrtqG+@mwanda
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 02a4aab..fd2de2b 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -431,7 +431,7 @@ enum {
static struct lock_class_key __key; \
struct gendisk *__disk = __blk_mq_alloc_disk(set, queuedata); \
\
- if (__disk) \
+ if (!IS_ERR(__disk)) \
lockdep_init_map(&__disk->lockdep_map, \
"(bio completion)", &__key, 0); \
__disk; \
