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List:       linux-block
Subject:    [PATCH V7 4/6] blk-mq: remove dead check from blk_mq_dispatch_rq_list
From:       Ming Lei <ming.lei () redhat ! com>
Date:       2020-06-30 10:24:59
Message-ID: 20200630102501.2238972-5-ming.lei () redhat ! com
[Download RAW message or body]

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

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