[PATCH V2 2/3] block: don't drain in-progress dispatch in blk_cleanup_queue()

Ming Lei
2019-04-01T04:43:09Z

Now freeing hw queue resource is moved to hctx's release handler,
we don't need to worry about the race between blk_cleanup_queue and
run queue any more.

So don't drain in-progress dispatch in blk_cleanup_queue().

This is basically revert of c2856ae2f315 ("blk-mq: quiesce queue before
freeing queue").

Cc: Dongli Zhang <dongli.zhang@oracle.com>
Cc: James Smart <james.smart@broadcom.com>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: linux-scsi@vger.kernel.org,
Cc: Martin K . Petersen <martin.petersen@oracle.com>,
Cc: Christoph Hellwig <hch@lst.de>,
Cc: James E . J . Bottomley <jejb@linux.vnet.ibm.com>,
Cc: jianchao wang <jianchao.w.wang@oracle.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
block/blk-core.c | 12 ------------
1 file changed, 12 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index b3bbf8a5110d..491dc0295778 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -347,18 +347,6 @@ void blk_cleanup_queue(struct request_queue *q)

blk_queue_flag_set(QUEUE_FLAG_DEAD, q);

- /*
- * make sure all in-progress dispatch are completed because
- * blk_freeze_queue() can only complete all requests, and
- * dispatch may still be in-progress since we dispatch requests
- * from more than one contexts.
- *
- * We rely on driver to deal with the race in case that queue
- * initialization isn't done.
- */
- if (queue_is_mq(q) && blk_queue_init_done(q))
- blk_mq_quiesce_queue(q);
-
/* for synchronous bio-based driver finish in-flight integrity i/o */
blk_flush_integrity();

--
2.9.5