From: Ming Lei Date: Thu, 20 Apr 2023 11:20:18 +0000 (+0800) Subject: Revert "block: Merge bio before checking ->cached_rq" X-Git-Tag: v6.6.7~3095^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=81ea1222f2fa5006f4b9759c2fe1ec154109622d;p=platform%2Fkernel%2Flinux-starfive.git Revert "block: Merge bio before checking ->cached_rq" This reverts commit 23f3e3272e7a4d9fb870485cd6df1e4f9539282c. blk-mq sched bio merge still needs request to grab queue usage counter, so we can't simply call blk_mq_attempt_bio_merge() when queue usage counter isn't held. Fixes: 23f3e3272e7a ("block: Merge bio before checking ->cached_rq") Cc: Xiao Ni Reported-by: Yi Zhang Signed-off-by: Ming Lei Link: https://lore.kernel.org/r/20230420112018.1108058-1-ming.lei@redhat.com Signed-off-by: Jens Axboe --- diff --git a/block/blk-mq.c b/block/blk-mq.c index f0ea9dcfb966..2831f78f86a0 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2878,16 +2878,15 @@ static inline struct request *blk_mq_get_cached_request(struct request_queue *q, if (!plug) return NULL; + rq = rq_list_peek(&plug->cached_rq); + if (!rq || rq->q != q) + return NULL; if (blk_mq_attempt_bio_merge(q, *bio, nsegs)) { *bio = NULL; return NULL; } - rq = rq_list_peek(&plug->cached_rq); - if (!rq || rq->q != q) - return NULL; - type = blk_mq_get_hctx_type((*bio)->bi_opf); hctx_type = rq->mq_hctx->type; if (type != hctx_type &&