From: John Garry <john.garry@huawei.com> mainline inclusion from mainline-v5.14-rc1 commit b93af3055d6f32d3b0361cfdb110c9399c1241ba category: bugfix bugzilla: 177012 https://gitee.com/openeuler/kernel/issues/I4DDEL Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... --------------------------- If the blk_mq_sched_alloc_tags() -> blk_mq_alloc_rqs() call fails, then we call blk_mq_sched_free_tags() -> blk_mq_free_rqs(). It is incorrect to do so, as any rqs would have already been freed in the blk_mq_alloc_rqs() call. Fix by calling blk_mq_free_rq_map() only directly. Fixes: 6917ff0b5bd41 ("blk-mq-sched: refactor scheduler initialization") Signed-off-by: John Garry <john.garry@huawei.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/1627378373-148090-1-git-send-email-john.garry@huaw... Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Laibin Qiu <qiulaibin@huawei.com> Reviewed-by: Jason Yan <yanaijie@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> --- block/blk-mq-sched.c | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-) diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index 581be65a53c1..d495c5fe5e6d 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -505,19 +505,6 @@ void blk_mq_sched_insert_requests(struct blk_mq_hw_ctx *hctx, percpu_ref_put(&q->q_usage_counter); } -static void blk_mq_sched_free_tags(struct blk_mq_tag_set *set, - struct blk_mq_hw_ctx *hctx, - unsigned int hctx_idx) -{ - unsigned int flags = set->flags & ~BLK_MQ_F_TAG_HCTX_SHARED; - - if (hctx->sched_tags) { - blk_mq_free_rqs(set, hctx->sched_tags, hctx_idx); - blk_mq_free_rq_map(hctx->sched_tags, flags); - hctx->sched_tags = NULL; - } -} - static int blk_mq_sched_alloc_tags(struct request_queue *q, struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) @@ -533,8 +520,10 @@ static int blk_mq_sched_alloc_tags(struct request_queue *q, return -ENOMEM; ret = blk_mq_alloc_rqs(set, hctx->sched_tags, hctx_idx, q->nr_requests); - if (ret) - blk_mq_sched_free_tags(set, hctx, hctx_idx); + if (ret) { + blk_mq_free_rq_map(hctx->sched_tags, set->flags); + hctx->sched_tags = NULL; + } return ret; } -- 2.20.1