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Message-ID: <1634114459-143003-1-git-send-email-john.garry@huawei.com>
Date: Wed, 13 Oct 2021 16:40:59 +0800
From: John Garry <john.garry@...wei.com>
To: <axboe@...nel.dk>
CC: <ming.lei@...hat.com>, <linux-block@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <kashyap.desai@...adcom.com>,
<hare@...e.de>, John Garry <john.garry@...wei.com>
Subject: [PATCH] blk-mq: Fix blk_mq_tagset_busy_iter() for shared tags
Since it is now possible for a tagset to share a single set of tags, the
iter function should not re-iter the tags for the count of #hw queues in
that case. Rather it should just iter once.
Fixes: e0fdf846c7bb ("blk-mq: Use shared tags for shared sbitmap support")
Reported-by: Kashyap Desai <kashyap.desai@...adcom.com>
Signed-off-by: John Garry <john.garry@...wei.com>
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 72a2724a4eee..c943b6529619 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -378,9 +378,12 @@ void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
busy_tag_iter_fn *fn, void *priv)
{
- int i;
+ unsigned int flags = tagset->flags;
+ int i, nr_tags;
+
+ nr_tags = blk_mq_is_shared_tags(flags) ? 1 : tagset->nr_hw_queues;
- for (i = 0; i < tagset->nr_hw_queues; i++) {
+ for (i = 0; i < nr_tags; i++) {
if (tagset->tags && tagset->tags[i])
__blk_mq_all_tag_iter(tagset->tags[i], fn, priv,
BT_TAG_ITER_STARTED);
--
2.26.2
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