blk-mq: remove dead check from blk_mq_dispatch_rq_list

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.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Tested-by: Baolin Wang <baolin.wang7@gmail.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Baolin Wang <baolin.wang7@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3e370f5..a80cb6e 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1426,13 +1426,6 @@ 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;
 }