linux-kernel - Re: [PATCH v1 1/1] ALSA: control: Use list_for_each_entry

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Date:   Tue, 29 Aug 2023 16:10:24 +0200
From:   Jaroslav Kysela <perex@...ex.cz>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH v1 1/1] ALSA: control: Use list_for_each_entry_safe()

On 29. 08. 23 15:52, Andy Shevchenko wrote:
> Instead of reiterating the list, use list_for_each_entry_safe()
> that allows to continue without starting over.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> 
> Takashi, if you have anybody or want yourself to spend some time,
> I believe you can simplify a lot the parser in this file with
> the help of lib/cmdline.c APIs.

You probably mean next_arg() function. Unfortunately, it does not handle all 
cases we need to parse. The control IDs are a bit different than standard 
arguments.

>   sound/core/control_led.c | 15 +++++----------
>   1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/sound/core/control_led.c b/sound/core/control_led.c
> index a78eb48927c7..afc9ffc388e3 100644
> --- a/sound/core/control_led.c
> +++ b/sound/core/control_led.c
> @@ -297,16 +297,13 @@ static void snd_ctl_led_clean(struct snd_card *card)
>   {
>   	unsigned int group;
>   	struct snd_ctl_led *led;
> -	struct snd_ctl_led_ctl *lctl;
> +	struct snd_ctl_led_ctl *lctl, _lctl;
>   
>   	for (group = 0; group < MAX_LED; group++) {
>   		led = &snd_ctl_leds[group];
> -repeat:
> -		list_for_each_entry(lctl, &led->controls, list)
> -			if (!card || lctl->card == card) {
> +		list_for_each_entry_safe(lctl, _lctl, &led->controls, list)
> +			if (!card || lctl->card == card)
>   				snd_ctl_led_ctl_destroy(lctl);
> -				goto repeat;
> -			}
>   	}
>   }
>   
> @@ -314,7 +311,7 @@ static int snd_ctl_led_reset(int card_number, unsigned int group)
>   {
>   	struct snd_card *card;
>   	struct snd_ctl_led *led;
> -	struct snd_ctl_led_ctl *lctl;
> +	struct snd_ctl_led_ctl *lctl, _lctl;
>   	struct snd_kcontrol_volatile *vd;
>   	bool change = false;
>   
> @@ -329,14 +326,12 @@ static int snd_ctl_led_reset(int card_number, unsigned int group)
>   		return -ENXIO;
>   	}
>   	led = &snd_ctl_leds[group];
> -repeat:
> -	list_for_each_entry(lctl, &led->controls, list)
> +	list_for_each_entry(lctl, _lctl, &led->controls, list)

The list_for_each_entry_safe() should be used here, too.

With the fix:

Reviewed-by: Jaroslav Kysela <perex@...ex.cz>

						Jaroslav
-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.