linux-kernel - [PATCH 3.10 317/319] dm: mark request_queue dead before destroying the DM device

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Message-Id: <1486322541-8206-218-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:22:19 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Bart Van Assche <bart.vanassche@...disk.com>,
        Mike Snitzer <snitzer@...hat.com>, Jiri Slaby <jslaby@...e.cz>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 317/319] dm: mark request_queue dead before destroying the DM device

From: Bart Van Assche <bart.vanassche@...disk.com>

commit 3b785fbcf81c3533772c52b717f77293099498d3 upstream.

This avoids that new requests are queued while __dm_destroy() is in
progress.

[js] use md->queue instead of non-present helper

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/md/dm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f69fed8..a77ef6c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2323,6 +2323,7 @@ EXPORT_SYMBOL_GPL(dm_device_name);
 
 static void __dm_destroy(struct mapped_device *md, bool wait)
 {
+	struct request_queue *q = md->queue;
 	struct dm_table *map;
 
 	might_sleep();
@@ -2333,6 +2334,10 @@ static void __dm_destroy(struct mapped_device *md, bool wait)
 	set_bit(DMF_FREEING, &md->flags);
 	spin_unlock(&_minor_lock);
 
+	spin_lock_irq(q->queue_lock);
+	queue_flag_set(QUEUE_FLAG_DYING, q);
+	spin_unlock_irq(q->queue_lock);
+
 	/*
 	 * Take suspend_lock so that presuspend and postsuspend methods
 	 * do not race with internal suspend.
-- 
2.8.0.rc2.1.gbe9624a