Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Fri, 28 Oct 2022 11:17:04 +0200
Message-ID: <87fsf8mhnz.wl-tiwai@suse.de>
From:   Takashi Iwai <tiwai@suse.de>
To:     Steven Rostedt <rostedt@goodmis.org>
Cc:     linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Stephen Boyd <sboyd@kernel.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, Austin Kim <austin.kim@lge.com>,
        alsa-devel@alsa-project.org
Subject: Re: [RFC][PATCH v2 29/31] timers: ALSA: Use del_timer_shutdown() before freeing timer
In-Reply-To: <20221027150930.702028779@goodmis.org>
References: <20221027150525.753064657@goodmis.org>
        <20221027150930.702028779@goodmis.org>
User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0
MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue")
Content-Type: text/plain; charset=US-ASCII
Precedence: bulk

On Thu, 27 Oct 2022 17:05:54 +0200,
Steven Rostedt wrote:
> 
> From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
> 
> Before a timer is freed, del_timer_shutdown() must be called.
> 
> Link: https://lore.kernel.org/all/20220407161745.7d6754b3@gandalf.local.home/
> 
> Cc: Jaroslav Kysela <perex@perex.cz>
> Cc: Takashi Iwai <tiwai@suse.com>
> Cc: Austin Kim <austin.kim@lge.com>
> Cc: alsa-devel@alsa-project.org
> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Reviewed-by: Takashi Iwai <tiwai@suse.de>

I think there are a few other codes in sound/* that should use
del_timer_shutdown() (although it works practically as is for now).
I'll convert them once when the API is included.


thanks,

Takashi

> ---
>  sound/i2c/other/ak4117.c | 2 +-
>  sound/synth/emux/emux.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/i2c/other/ak4117.c b/sound/i2c/other/ak4117.c
> index 1bc43e927d82..5269ab7321a4 100644
> --- a/sound/i2c/other/ak4117.c
> +++ b/sound/i2c/other/ak4117.c
> @@ -47,7 +47,7 @@ static void reg_dump(struct ak4117 *ak4117)
>  
>  static void snd_ak4117_free(struct ak4117 *chip)
>  {
> -	del_timer_sync(&chip->timer);
> +	del_timer_shutdown(&chip->timer);
>  	kfree(chip);
>  }
>  
> diff --git a/sound/synth/emux/emux.c b/sound/synth/emux/emux.c
> index a870759d179e..a43025f466bb 100644
> --- a/sound/synth/emux/emux.c
> +++ b/sound/synth/emux/emux.c
> @@ -129,7 +129,7 @@ int snd_emux_free(struct snd_emux *emu)
>  	if (! emu)
>  		return -EINVAL;
>  
> -	del_timer_sync(&emu->tlist);
> +	del_timer_shutdown(&emu->tlist);
>  
>  	snd_emux_proc_free(emu);
>  	snd_emux_delete_virmidi(emu);
> -- 
> 2.35.1
>