[PATCH] drm: Silence the compiler for drm_mode_get_hv_timings()

[Deucher, Alexander]

> -----Original Message-----
> From: Chris Wilson [mailto:chris.ickle.wilson at gmail.com] On Behalf Of Chris
> Wilson
> Sent: Thursday, January 26, 2017 6:44 AM
> To: dri-devel at lists.freedesktop.org
> Cc: Chris Wilson; Daniel Vetter; Deucher, Alexander
> Subject: [PATCH] drm: Silence the compiler for drm_mode_get_hv_timings()
> 
> Since moving drm_crtc_get_hv_timings() into drm_modes.c, the compiler
> has been able to get smarter and spots that drm_mode_copy() is trying to
> preserve garbage from the stack.
> 
> Fixes: 196cd5d3758c ("drm:
> s/drm_crtc_get_hv_timings/drm_mode_get_hv_timings/")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter at intel.com>
> Cc: Alex Deucher <alexander.deucher at amd.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/drm_modes.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 73ed6399c3fb..a8616b1a8d22 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -808,9 +808,8 @@ EXPORT_SYMBOL(drm_mode_vrefresh);
>  void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
>  			    int *hdisplay, int *vdisplay)
>  {
> -	struct drm_display_mode adjusted;
> +	struct drm_display_mode adjusted = *mode;
> 
> -	drm_mode_copy(&adjusted, mode);
>  	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
>  	*hdisplay = adjusted.crtc_hdisplay;
>  	*vdisplay = adjusted.crtc_vdisplay;
> --
> 2.11.0