Subject: Re: [PATCH] ASoC: mediatek: mt2701: fix snprintf bounds

From: David Laight <[email-masked]>
Date: Wed, 20 May 2026 14:12:02 +0100

On Mon, 18 May 2026 18:04:40 -0700
Rosen Penev <[email-masked]> wrote:

> For whatever reason, GCC is unable to figure out that i2s_num is a
> single digit number, with MT2701_BASE_CLK_NUM being the maximum value it
> represents. Add a min() call to help it out and fix W=1 errors regarding
> snprintf bounds.
> 
> Signed-off-by: Rosen Penev <[email-masked]>
> ---
>  sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c b/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c
> index 5a2bcf027b4f..43157f218409 100644
> --- a/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c
> +++ b/sound/soc/mediatek/mt2701/mt2701-afe-clock-ctrl.c
> @@ -25,6 +25,7 @@ static const char *const base_clks[] = {
>  int mt2701_init_clock(struct mtk_base_afe *afe)
>  {
>  	struct mt2701_afe_private *afe_priv = afe->platform_priv;
> +	int i2s_num;
>  	int i;
>  
>  	for (i = 0; i < MT2701_BASE_CLK_NUM; i++) {
> @@ -35,8 +36,9 @@ int mt2701_init_clock(struct mtk_base_afe *afe)
>  		}
>  	}
>  
> +	i2s_num = min(MT2701_BASE_CLK_NUM, afe_priv->soc->i2s_num);

To me that is backwards, like an 'if' put the variable before the limit.

>  	/* Get I2S related clocks */
> -	for (i = 0; i < afe_priv->soc->i2s_num; i++) {
> +	for (i = 0; i < i2s_num; i++) {

Caching the limit also stops the compiler having to read it every iteration.

-- David

>  		struct mt2701_i2s_path *i2s_path = &afe_priv->i2s_path[i];
>  		struct clk *i2s_ck;
>  		char name[13];