linux-kernel - Re: [PATCH] drm/modes: Replace deprecated simple

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Date: Thu, 01 Feb 2024 12:03:15 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Cong Liu <liucong2@...inos.cn>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>
Cc: Cong Liu <liucong2@...inos.cn>, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/modes: Replace deprecated simple_strtol with kstrtol

On Thu, 01 Feb 2024, Cong Liu <liucong2@...inos.cn> wrote:
> This patch replaces the use of the deprecated simple_strtol [1] function
> in the drm_modes.c file with the recommended kstrtol function. This change
> improves error handling and boundary checks.
>
> [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#simple-strtol-simple-strtoll-simple-strtoul-simple-strtoull
>
> Signed-off-by: Cong Liu <liucong2@...inos.cn>

This is completely wrong, and obviously not tested at all.

The recommended replacements are *not* drop-in replacements. Look into
the documentation of the functions.

BR,
Jani.

> ---
>  drivers/gpu/drm/drm_modes.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 893f52ee4926..fce0fb1df9b2 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1942,7 +1942,7 @@ static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
>  		return -EINVAL;
>  
>  	str++;
> -	bpp = simple_strtol(str, end_ptr, 10);
> +	bpp = kstrtol(str, end_ptr, 10);
>  	if (*end_ptr == str)
>  		return -EINVAL;
>  
> @@ -1961,7 +1961,7 @@ static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
>  		return -EINVAL;
>  
>  	str++;
> -	refresh = simple_strtol(str, end_ptr, 10);
> +	refresh = kstrtol(str, end_ptr, 10);
>  	if (*end_ptr == str)
>  		return -EINVAL;
>  
> @@ -2033,7 +2033,7 @@ static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
>  	int remaining, i;
>  	char *end_ptr;
>  
> -	xres = simple_strtol(str, &end_ptr, 10);
> +	xres = kstrtol(str, &end_ptr, 10);
>  	if (end_ptr == str)
>  		return -EINVAL;
>  
> @@ -2042,7 +2042,7 @@ static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
>  	end_ptr++;
>  
>  	str = end_ptr;
> -	yres = simple_strtol(str, &end_ptr, 10);
> +	yres = kstrtol(str, &end_ptr, 10);
>  	if (end_ptr == str)
>  		return -EINVAL;
>  
> @@ -2100,7 +2100,7 @@ static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
>  		return -EINVAL;
>  
>  	value = delim + 1;
> -	*int_ret = simple_strtol(value, &endp, 10);
> +	*int_ret = kstrtol(value, &endp, 10);
>  
>  	/* Make sure we have parsed something */
>  	if (endp == value)

-- 
Jani Nikula, Intel