linux-kernel - Re: [RFC][PATCH v2 29/31] timers: ALSA: Use del_timer

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Date:   Fri, 28 Oct 2022 11:17:04 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Austin Kim <austin.kim@....com>,
        alsa-devel@...a-project.org
Subject: Re: [RFC][PATCH v2 29/31] timers: ALSA: Use del_timer_shutdown() before freeing timer

On Thu, 27 Oct 2022 17:05:54 +0200,
Steven Rostedt wrote:
> 
> From: "Steven Rostedt (Google)" <rostedt@...dmis.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@...ex.cz>
> Cc: Takashi Iwai <tiwai@...e.com>
> Cc: Austin Kim <austin.kim@....com>
> Cc: alsa-devel@...a-project.org
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>

Reviewed-by: Takashi Iwai <tiwai@...e.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
>