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authorKeith Busch <kbusch@kernel.org>2020-04-07 03:13:48 +0900
committerJens Axboe <axboe@kernel.dk>2020-04-06 13:43:56 -0600
commit536167d47ade11a5540b4b1a7125308b1641da7a (patch)
treec6f6d8d729c0a6dc01880e56e3969ca6f013fbe2 /block
parentc52abf563049e787c1341cdf15c7dbe1bfbc951b (diff)
downloadlinux-sh-536167d47ade11a5540b4b1a7125308b1641da7a.tar.gz
blk-mq: don't commit_rqs() if none were queued
Unburden the drivers from checking if a call to commit_rqs() is valid by not calling it when there are no requests to commit. Signed-off-by: Keith Busch <kbusch@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index f6291ceedee4..8e56884fd2e9 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1289,7 +1289,7 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list,
* the driver there was more coming, but that turned out to
* be a lie.
*/
- if (q->mq_ops->commit_rqs)
+ if (q->mq_ops->commit_rqs && queued)
q->mq_ops->commit_rqs(hctx);
spin_lock(&hctx->lock);
@@ -1911,6 +1911,8 @@ blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last)
void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
struct list_head *list)
{
+ int queued = 0;
+
while (!list_empty(list)) {
blk_status_t ret;
struct request *rq = list_first_entry(list, struct request,
@@ -1926,7 +1928,8 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
break;
}
blk_mq_end_request(rq, ret);
- }
+ } else
+ queued++;
}
/*
@@ -1934,7 +1937,7 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
* the driver there was more coming, but that turned out to
* be a lie.
*/
- if (!list_empty(list) && hctx->queue->mq_ops->commit_rqs)
+ if (!list_empty(list) && hctx->queue->mq_ops->commit_rqs && queued)
hctx->queue->mq_ops->commit_rqs(hctx);
}