This reverts commit 127276c6ce5a30fcc806b7fe53015f4f89b62956.
When all CPUs of one hw queue become offline, there still may have IOs
not completed from this hctx. But blk_mq_hw_queue_mapped() is called in
blk_mq_queue_tag_busy_iter(), which is used for iterating request in timeout
handler, timeout event will be missed on the inactive hctx, then request may
never be completed.
Also the replementation of blk_mq_hw_queue_mapped() doesn't match the helper's
name any more, and it should have been named as blk_mq_hw_queue_active().
Even other callers need further verification about this reimplemenation.
So revert this patch now, and we can improve hw queue activate/inactivate event
after adequent researching and test.
Cc: Stefan Haberland <sth@xxxxxxxxxxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Reported-by: Jens Axboe <axboe@xxxxxxxxx>
Fixes: 127276c6ce5a30fcc ("blk-mq: reimplement blk_mq_hw_queue_mapped")
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
block/blk-mq.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 502af371b83b..88c558f71819 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -181,7 +181,7 @@ static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
{
- return cpumask_first_and(hctx->cpumask, cpu_online_mask) < nr_cpu_ids;
+ return hctx->nr_ctx && hctx->tags;
}
void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part,
--
2.9.5
