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From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org, Ming Lei <ming.lei@redhat.com>,
	Sagi Grimberg <sagi@grimberg.me>,
	Baolin Wang <baolin.wang7@gmail.com>,
	Christoph Hellwig <hch@infradead.org>,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: [PATCH V7 4/6] blk-mq: remove dead check from blk_mq_dispatch_rq_list
Date: Tue, 30 Jun 2020 18:24:59 +0800
Message-ID: <20200630102501.2238972-5-ming.lei@redhat.com> (raw)
In-Reply-To: <20200630102501.2238972-1-ming.lei@redhat.com>

When BLK_STS_RESOURCE or BLK_STS_DEV_RESOURCE is returned from
.queue_rq, the 'list' variable always holds this rq which isn't
queued to LLD successfully.

So blk_mq_dispatch_rq_list() always returns false from the branch
of '!list_empty(list)'.

No functional change.

Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Baolin Wang <baolin.wang7@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
Tested-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 block/blk-mq.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 39a2332e32ac..0a6fb6d647f6 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1482,13 +1482,6 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *hctx, struct list_head *list,
 	} else
 		blk_mq_update_dispatch_busy(hctx, false);
 
-	/*
-	 * If the host/device is unable to accept more work, inform the
-	 * caller of that.
-	 */
-	if (ret == BLK_STS_RESOURCE || ret == BLK_STS_DEV_RESOURCE)
-		return false;
-
 	return (queued + errors) != 0;
 }
 
-- 
2.25.2


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30 10:24 [PATCH V7 0/6] blk-mq: support batching dispatch from scheduler Ming Lei
2020-06-30 10:24 ` [PATCH V7 1/6] blk-mq: pass request queue into get/put budget callback Ming Lei
2020-06-30 10:24 ` [PATCH V7 2/6] blk-mq: pass hctx to blk_mq_dispatch_rq_list Ming Lei
2020-06-30 10:24 ` [PATCH V7 3/6] blk-mq: move getting driver tag and budget into one helper Ming Lei
2020-06-30 10:24 ` Ming Lei [this message]
2020-06-30 10:25 ` [PATCH V7 5/6] blk-mq: pass obtained budget count to blk_mq_dispatch_rq_list Ming Lei
2020-06-30 10:25 ` [PATCH V7 6/6] blk-mq: support batching dispatch in case of io Ming Lei
2020-06-30 13:40   ` Christoph Hellwig
2020-06-30 14:03 ` [PATCH V7 0/6] blk-mq: support batching dispatch from scheduler Jens Axboe

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