diff mbox series

[V5,7/9] blk-mq: move cancel of hctx->run_work into blk_mq_hw_sysfs_release

Message ID 20190412033032.10418-8-ming.lei@redhat.com (mailing list archive)
State Superseded
Headers show
Series blk-mq: fix races related with freeing queue | expand

Commit Message

Ming Lei April 12, 2019, 3:30 a.m. UTC
hctx is always released after requeue is freed.

With holding queue's kobject refcount, it is safe for driver to run queue,
so one run queue might be scheduled after blk_sync_queue() is done.

So moving the cancel of hctx->run_work into blk_mq_hw_sysfs_release()
for avoiding run released 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>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 block/blk-core.c     | 8 --------
 block/blk-mq-sysfs.c | 2 ++
 2 files changed, 2 insertions(+), 8 deletions(-)

Comments

Hannes Reinecke April 12, 2019, 11:08 a.m. UTC | #1
On 4/12/19 5:30 AM, Ming Lei wrote:
> hctx is always released after requeue is freed.
> 
> With holding queue's kobject refcount, it is safe for driver to run queue,
> so one run queue might be scheduled after blk_sync_queue() is done.
> 
> So moving the cancel of hctx->run_work into blk_mq_hw_sysfs_release()
> for avoiding run released 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>
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> ---
>   block/blk-core.c     | 8 --------
>   block/blk-mq-sysfs.c | 2 ++
>   2 files changed, 2 insertions(+), 8 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
diff mbox series

Patch

diff --git a/block/blk-core.c b/block/blk-core.c
index 20298aa5a77c..ad17e999f79e 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -232,14 +232,6 @@  void blk_sync_queue(struct request_queue *q)
 {
 	del_timer_sync(&q->timeout);
 	cancel_work_sync(&q->timeout_work);
-
-	if (queue_is_mq(q)) {
-		struct blk_mq_hw_ctx *hctx;
-		int i;
-
-		queue_for_each_hw_ctx(q, hctx, i)
-			cancel_delayed_work_sync(&hctx->run_work);
-	}
 }
 EXPORT_SYMBOL(blk_sync_queue);
 
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 4040e62c3737..25c0d0a6a556 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -35,6 +35,8 @@  static void blk_mq_hw_sysfs_release(struct kobject *kobj)
 	struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
 						  kobj);
 
+	cancel_delayed_work_sync(&hctx->run_work);
+
 	if (hctx->flags & BLK_MQ_F_BLOCKING)
 		cleanup_srcu_struct(hctx->srcu);
 	blk_free_flush_queue(hctx->fq);