linux-kernel - Re: [PATCH] phy: sun4i-usb: Fix a W=1 compilation failure

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Message-ID: <3520089.iIbC2pHGDl@jernej-laptop>
Date:   Sun, 24 Sep 2023 22:01:26 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH] phy: sun4i-usb: Fix a W=1 compilation failure

Dne nedelja, 03. september 2023 ob 12:11:06 CEST je Christophe JAILLET napisal(a):
> With gcc 12.3.0, when this file is built, we get errors such as:
> 
> drivers/phy/allwinner/phy-sun4i-usb.c: In function ‘sun4i_usb_phy_probe’:
> drivers/phy/allwinner/phy-sun4i-usb.c:790:52: error: ‘_vbus’ directive output may be truncated writing 5 bytes into a region of size between 2 and 12 [-Werror=format-truncation=]
>   790 |                 snprintf(name, sizeof(name), "usb%d_vbus", i);
>       |                                                    ^~~~~
> drivers/phy/allwinner/phy-sun4i-usb.c:790:17: note: ‘snprintf’ output between 10 and 20 bytes into a destination of size 16
>   790 |                 snprintf(name, sizeof(name), "usb%d_vbus", i);
>       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Because of the possible value of 'i', this can't be an issue in real world
> application, but in order to have "make W=1" work correctly, give more
> space for 'name'.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
>  drivers/phy/allwinner/phy-sun4i-usb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
> index ec551464dd4f..e53a9a9317bc 100644
> --- a/drivers/phy/allwinner/phy-sun4i-usb.c
> +++ b/drivers/phy/allwinner/phy-sun4i-usb.c
> @@ -782,7 +782,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>  
>  	for (i = 0; i < data->cfg->num_phys; i++) {
>  		struct sun4i_usb_phy *phy = data->phys + i;
> -		char name[16];
> +		char name[32];
>  
>  		if (data->cfg->missing_phys & BIT(i))
>  			continue;
>