From: Christoph Hellwig <hch@lst.de>
Date: Mon, 26 May 2014 09:45:02 +0000 (+0200)
Subject: blk-mq: idle all hardware contexts before freeing a queue
X-Git-Tag: v3.16-rc1~30^2~49^2~25
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=19c5d84f14d2b01fe4c24e1444142f69e6dc08f6;p=linux.git

blk-mq: idle all hardware contexts before freeing a queue

Without this we can leak the active_queues reference if a command is
freed while it is considered active.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9bc075335d06..62082c5daae7 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1844,6 +1844,7 @@ void blk_mq_free_queue(struct request_queue *q)
 	blk_mq_del_queue_tag_set(q);
 
 	queue_for_each_hw_ctx(q, hctx, i) {
+		blk_mq_tag_idle(hctx);
 		kfree(hctx->ctxs);
 		blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier);
 		if (q->mq_ops->exit_hctx)