On Thu, May 12, 2016 at 04:00:38PM +0300, Imre Deak wrote:
> Returning a 0 bpp/cpp value from these functions isn't ever valid. In
> many cases it can also lead to a div-by-zero possibly at some later
> point in time, so make sure we catch such errors as soon as possible via
> louder error reporting.
>
> CC: Dave Airlie <airlied@xxxxxxxxxx>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_crtc.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index 70f9c68..3a32606 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -5610,8 +5610,8 @@ void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
> *bpp = 32;
> break;
> default:
> - DRM_DEBUG_KMS("unsupported pixel format %s\n",
> - drm_get_format_name(format));
> + WARN(1, "unsupported pixel format %s\n",
> + drm_get_format_name(format));
NAK. This will happen every time drm_helper_mode_fill_fb_struct()
is called with a non-RGB format.
> *depth = 0;
> *bpp = 0;
> break;
> @@ -5666,8 +5666,12 @@ int drm_format_plane_cpp(uint32_t format, int plane)
> unsigned int depth;
> int bpp;
>
> - if (plane >= drm_format_num_planes(format))
> + if (plane >= drm_format_num_planes(format)) {
> + WARN(1, "invalid plane %d for format %s\n",
> + plane, drm_get_format_name(format));
> +
We have this check in many places. Should either convert all or none.
> return 0;
> + }
>
> switch (format) {
> case DRM_FORMAT_YUYV:
> --
> 2.5.0
>
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--
Ville Syrjälä
Intel OTC
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