linux-kernel - Re: [RFC][PATCH v2 00/31] timers: Use del_timer

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Date:   Thu, 27 Oct 2022 19:55:09 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [RFC][PATCH v2 00/31] timers: Use del_timer_shutdown() before
 freeing timers

On Thu, 27 Oct 2022 16:24:42 -0700
Guenter Roeck <linux@...ck-us.net> wrote:

> > This is probably just missing a switch to shutdown.
> >   
> Wild shot, and I don't really know what I am doing,
> but I'll try
> 
> iff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
> index e71b3b43927c..6c1cb4a219f0 100644
> --- a/block/blk-sysfs.c
> +++ b/block/blk-sysfs.c
> @@ -767,6 +767,8 @@ static void blk_release_queue(struct kobject *kobj)
> 
>         might_sleep();
> 
> +       del_timer_shutdown(&q->timeout);
> +
>         percpu_ref_exit(&q->q_usage_counter);
> 
>         if (q->poll_stat)

Or perhaps this:

-- Steve

diff --git a/block/blk-core.c b/block/blk-core.c
index 17667159482e..69b1daa2e91a 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -227,7 +227,7 @@ const char *blk_status_to_str(blk_status_t status)
  */
 void blk_sync_queue(struct request_queue *q)
 {
-	del_timer_sync(&q->timeout);
+	del_timer_shutdown(&q->timeout);
 	cancel_work_sync(&q->timeout_work);
 }
 EXPORT_SYMBOL(blk_sync_queue);
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index e71b3b43927c..12a1e46536ed 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -769,6 +769,8 @@ static void blk_release_queue(struct kobject *kobj)
 
 	percpu_ref_exit(&q->q_usage_counter);
 
+	blk_sync_queue(q);
+
 	if (q->poll_stat)
 		blk_stat_remove_callback(q, q->poll_cb);
 	blk_stat_free_callback(q->poll_cb);