linux-kernel - [PATCH] blk-mq: Properly init bios from blk_mq_alloc_request

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Date:   Sun, 23 Oct 2022 00:07:26 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>
CC:     <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <hch@....de>, John Garry <john.garry@...wei.com>
Subject: [PATCH] blk-mq: Properly init bios from blk_mq_alloc_request_hctx()

Function blk_mq_alloc_request_hctx() is missing zeroing/init of rq->bio,
biotail, __sector, and __data_len members, which blk_mq_alloc_request()
has.

Move init'ing of those members to common blk_mq_rq_ctx_init().

Fixes: 1f5bd336b9150 ("blk-mq: add blk_mq_alloc_request_hctx")
Suggested-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: John Garry <john.garry@...wei.com>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 8070b6c10e8d..260adeb2e455 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -402,6 +402,10 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
 		}
 	}
 
+	rq->__data_len = 0;
+	rq->__sector = (sector_t) -1;
+	rq->bio = rq->biotail = NULL;
+
 	return rq;
 }
 
@@ -591,9 +595,6 @@ struct request *blk_mq_alloc_request(struct request_queue *q, blk_opf_t opf,
 		if (!rq)
 			goto out_queue_exit;
 	}
-	rq->__data_len = 0;
-	rq->__sector = (sector_t) -1;
-	rq->bio = rq->biotail = NULL;
 	return rq;
 out_queue_exit:
 	blk_queue_exit(q);
-- 
2.35.3