linux-kernel - Re: [PATCH] drm: xlnx: Fix return type of zynqmp_dp_connector_mode

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Date:   Mon, 19 Sep 2022 20:09:16 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Nathan Huckleberry <nhuck@...gle.com>
Cc:     Dan Carpenter <error27@...il.com>, llvm@...ts.linux.dev,
        Hyun Kwon <hyun.kwon@...inx.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Michal Simek <michal.simek@...inx.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: xlnx: Fix return type of
 zynqmp_dp_connector_mode_valid

Hi Nathan,

Thank you for the patch.

On Tue, Sep 13, 2022 at 01:56:00PM -0700, Nathan Huckleberry wrote:
> The mode_valid field in drm_connector_helper_funcs is expected to be of
> type
> enum drm_mode_status (* mode_valid) (struct drm_connector *connector,
>                                      struct drm_display_mode *mode);
> 
> The mismatched return type breaks forward edge kCFI since the underlying
> function definition does not match the function hook definition.
> 
> The return type of zynqmp_dp_connector_mode_valid 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>

I'm not sure what forward edge kCFI is, but the fix looks good, so

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/gpu/drm/xlnx/zynqmp_dp.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> index d14612b34796..f571b08d23d3 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
> @@ -1352,8 +1352,9 @@ zynqmp_dp_connector_best_encoder(struct drm_connector *connector)
>  	return &dp->encoder;
>  }
>  
> -static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
> -					  struct drm_display_mode *mode)
> +static enum drm_mode_status
> +zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
> +			       struct drm_display_mode *mode)
>  {
>  	struct zynqmp_dp *dp = connector_to_dp(connector);
>  	u8 max_lanes = dp->link_config.max_lanes;

-- 
Regards,

Laurent Pinchart