[PATCH] ALSA: control_led: fix stack frame usage over 1024 bytes in snd_ctl_led_get()

[Jaroslav Kysela]

Dne 04. 04. 21 v 8:59 Takashi Sakamoto napsal(a):
> GCC warns that snd_ctl_led_get() uses stack frame over 1024 bytes.
> 
> control_led.c: In function ‘snd_ctl_led_get’:
> control_led.c:128:1: warning: the frame size of 1504 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> When taking care of convension in Linux kernel development. it's preferable
> to suppress too large usage of kernel stack, when the function call is not
> in critical part.
> 
> This commit fixes the bug, including some minor code refactoring relevant
> to variable names.
> 
> Fixes: 22d8de62f11b ("ALSA: control - add generic LED trigger module as the new control layer")
> Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
> ---
>  sound/core/control_led.c | 68 ++++++++++++++++++++++++++--------------
>  1 file changed, 44 insertions(+), 24 deletions(-)
> 
> diff --git a/sound/core/control_led.c b/sound/core/control_led.c
> index b97f118cd54e..1be854a861f0 100644
> --- a/sound/core/control_led.c
> +++ b/sound/core/control_led.c
> @@ -94,34 +94,35 @@ static struct snd_ctl_led *snd_ctl_led_get_by_access(unsigned int access)
>  	return &snd_ctl_leds[group];
>  }
>  
> -static int snd_ctl_led_get(struct snd_ctl_led_ctl *lctl)
> +static int snd_ctl_led_get(struct snd_ctl_led_ctl *lctl, struct snd_ctl_elem_info *elem_info,
> +			   struct snd_ctl_elem_value *elem_value)

I think info, value should be enough as names for the arguments here. It
increases readability.

					Jaroslav

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