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authorMing Lei <ming.lei@redhat.com>2017-11-30 07:56:35 +0800
committerJens Axboe <axboe@kernel.dk>2018-01-05 09:09:48 -0700
commit454be724f6f99cc7e7bbf15067128be9868186c6 (patch)
tree6471f6c7b9d06b8172eb05edf07ec45680637aef /block/blk-mq.c
parent6d0e4827b72afc71349784336d5eb6df4df106e6 (diff)
downloadlinux-454be724f6f99cc7e7bbf15067128be9868186c6.tar.bz2
block: drain queue before waiting for q_usage_counter becoming zero
Now we track legacy requests with .q_usage_counter in commit 055f6e18e08f ("block: Make q_usage_counter also track legacy requests"), but that commit never runs and drains legacy queue before waiting for this counter becoming zero, then IO hang is caused in the test of pulling disk during IO. This patch fixes the issue by draining requests before waiting for q_usage_counter becoming zero, both Mauricio and chenxiang reported this issue, and observed that it can be fixed by this patch. Link: https://marc.info/?l=linux-block&m=151192424731797&w=2 Fixes: 055f6e18e08f("block: Make q_usage_counter also track legacy requests") Cc: Wen Xiong <wenxiong@us.ibm.com> Tested-by: "chenxiang (M)" <chenxiang66@hisilicon.com> Tested-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.c')
-rw-r--r--block/blk-mq.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 11097477eeab..3d3797327491 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -161,6 +161,8 @@ void blk_freeze_queue(struct request_queue *q)
* exported to drivers as the only user for unfreeze is blk_mq.
*/
blk_freeze_queue_start(q);
+ if (!q->mq_ops)
+ blk_drain_queue(q);
blk_mq_freeze_queue_wait(q);
}