From: John Garry <john.garry@huawei.com>
Date: Tue, 5 Oct 2021 10:23:26 +0000 (+0800)
Subject: blk-mq: Change rqs check in blk_mq_free_rqs()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=65de57bb2e66f1fbede166c1307570ebd09eae83;p=linux.git

blk-mq: Change rqs check in blk_mq_free_rqs()

The original code in commit 24d2f90309b23 ("blk-mq: split out tag
initialization, support shared tags") would check tags->rqs is non-NULL and
then dereference tags->rqs[].

Then in commit 2af8cbe30531 ("blk-mq: split tag ->rqs[] into two"), we
started to dereference tags->static_rqs[], but continued to check non-NULL
tags->rqs.

Check tags->static_rqs as non-NULL instead, which is more logical.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/1633429419-228500-2-git-send-email-john.garry@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2539ba976949c..03cbde75756d2 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2349,7 +2349,7 @@ void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
 {
 	struct page *page;
 
-	if (tags->rqs && set->ops->exit_request) {
+	if (tags->static_rqs && set->ops->exit_request) {
 		int i;
 
 		for (i = 0; i < tags->nr_tags; i++) {