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blk-mq: Fix blk_mq_tagset_busy_iter() for shared tags

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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: e155b0c238 ("blk-mq: Use shared tags for shared sbitmap support")
Reported-by: Kashyap Desai <[email protected]>
Signed-off-by: John Garry <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Tested-by: Kashyap Desai <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
John Garry authored and Jens Axboe committed 2021-10-21 08:21:52 -06:00
1 parent 008f75a20e
commit 0994c64eb4
1 file changed
+5 -2
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block/blk-mq-tag.c
+5 -2
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@@ -399,9 +399,12 @@ 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;
for (i = 0; i < tagset->nr_hw_queues; i++) {
nr_tags = blk_mq_is_shared_tags(flags) ? 1 : tagset->nr_hw_queues;
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);