linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: Fix return type of mode

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Date:   Wed, 14 Sep 2022 15:47:16 +0200
From:   Andrzej Hajda <andrzej.hajda@...el.com>
To:     Nathan Huckleberry <nhuck@...gle.com>
Cc:     Lucas De Marchi <lucas.demarchi@...el.com>, llvm@...ts.linux.dev,
        Dan Carpenter <error27@...il.com>,
        David Airlie <airlied@...ux.ie>, Tom Rix <trix@...hat.com>,
        intel-gfx@...ts.freedesktop.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Fix return type of mode_valid
 function hook

On 13.09.2022 22:55, Nathan Huckleberry wrote:
> All of the functions used for intel_dvo_dev_ops.mode_valid have a return
> type of enum drm_mode_status, but the mode_valid field in the struct
> definition has a return type of int.
> 
> The mismatched return type breaks forward edge kCFI since the underlying
> function definitions do not match the function hook definition.
> 
> The return type of the mode_valid field should be changed from int to
> enum drm_mode_status.
> 
> Reported-by: Dan Carpenter <error27@...il.com>
> Link: https://github.com/ClangBuiltLinux/linux/issues/1703
> Cc: llvm@...ts.linux.dev
> Signed-off-by: Nathan Huckleberry <nhuck@...gle.com>

Reviewed-by: Andrzej Hajda <andrzej.hajda@...el.com>

Regards
Andrzej

> ---
>   drivers/gpu/drm/i915/display/intel_dvo_dev.h | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dvo_dev.h b/drivers/gpu/drm/i915/display/intel_dvo_dev.h
> index d96c3cc46e50..50205f064d93 100644
> --- a/drivers/gpu/drm/i915/display/intel_dvo_dev.h
> +++ b/drivers/gpu/drm/i915/display/intel_dvo_dev.h
> @@ -75,8 +75,8 @@ struct intel_dvo_dev_ops {
>   	 *
>   	 * \return MODE_OK if the mode is valid, or another MODE_* otherwise.
>   	 */
> -	int (*mode_valid)(struct intel_dvo_device *dvo,
> -			  struct drm_display_mode *mode);
> +	enum drm_mode_status (*mode_valid)(struct intel_dvo_device *dvo,
> +					   struct drm_display_mode *mode);
>   
>   	/*
>   	 * Callback for preparing mode changes on an output