Home Home > GIT Browse
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2019-10-15 08:49:27 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-10-29 09:22:47 +0100
commit37b4a8252dfd6060d2ffe9beecab4e58330d62a3 (patch)
tree6922874f0d92d65cea884ba0dc2ff6b30da5c223
parentd07e3066ffa045e7ec5f81ca67951b03f3bfb97c (diff)
blk-rq-qos: fix first node deletion of rq_qos_del()
commit 307f4065b9d7c1e887e8bdfb2487e4638559fea1 upstream. rq_qos_del() incorrectly assigns the node being deleted to the head if it was the first on the list in the !prev path. Fix it by iterating with ** instead. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Josef Bacik <josef@toxicpanda.com> Fixes: a79050434b45 ("blk-rq-qos: refactor out common elements of blk-wbt") Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--block/blk-rq-qos.h13
1 files changed, 5 insertions, 8 deletions
diff --git a/block/blk-rq-qos.h b/block/blk-rq-qos.h
index c0f0778d5396..8378f68a21ac 100644
--- a/block/blk-rq-qos.h
+++ b/block/blk-rq-qos.h
@@ -103,16 +103,13 @@ static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
{
- struct rq_qos *cur, *prev = NULL;
- for (cur = q->rq_qos; cur; cur = cur->next) {
- if (cur == rqos) {
- if (prev)
- prev->next = rqos->next;
- else
- q->rq_qos = cur;
+ struct rq_qos **cur;
+
+ for (cur = &q->rq_qos; *cur; cur = &(*cur)->next) {
+ if (*cur == rqos) {
+ *cur = rqos->next;
break;
}
- prev = cur;
}
blk_mq_debugfs_unregister_rqos(rqos);