diff options
| author | Keith Busch <kbusch@kernel.org> | 2020-04-06 20:13:48 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-04-06 21:43:56 +0200 |
| commit | 536167d47ade11a5540b4b1a7125308b1641da7a (patch) | |
| tree | c6f6d8d729c0a6dc01880e56e3969ca6f013fbe2 /block/blk-mq.c | |
| parent | loop: Better discard support for block devices (diff) | |
| download | linux-536167d47ade11a5540b4b1a7125308b1641da7a.tar.xz linux-536167d47ade11a5540b4b1a7125308b1641da7a.zip | |
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/blk-mq.c')
| -rw-r--r-- | block/blk-mq.c | 9 |
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); } |