Re: [PATCH 3/4] drm/i915: Fix calculation of rotated x and y offsets for planar formats

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Fri, Jan 20, 2017 at 04:28:44PM +0200, Ander Conselvan de Oliveira wrote:
> Parameters tile_size, tile_width and tile_height were passed in the
> wrong order to _intel_adjust_tile_offset() when calculating the rotated
> offsets.
> 
> This doesn't fix any user visible bug, since for packaged formats new
> and old offset are the same and the rotated offsets are within a tile
> before they are fed to _intel_adjust_tile_offset(). In that case, the
> offsets are unchanged. That is not true for planar formats, but those
> are currently not supported.
> 
> Found by coverity.
> 
> Fixes: 66a2d927cb0e ("drm/i915: Make intel_adjust_tile_offset() work for linear buffers")
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
> Cc: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: intel-gfx@lists.freedesktop.org
> Cc: <stable@vger.kernel.org> # v4.9+
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

/me should really dig up whatever fb offset tests I had written earlier
and try to finish then...

> ---
>  drivers/gpu/drm/i915/intel_display.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index bddadd9..0759e8b 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2578,8 +2578,9 @@ intel_fill_fb_info(struct drm_i915_private *dev_priv,
>  			 * We only keep the x/y offsets, so push all of the
>  			 * gtt offset into the x/y offsets.
>  			 */
> -			_intel_adjust_tile_offset(&x, &y, tile_size,
> -						  tile_width, tile_height, pitch_tiles,
> +			_intel_adjust_tile_offset(&x, &y,
> +						  tile_width, tile_height,
> +						  tile_size, pitch_tiles,
>  						  gtt_offset_rotated * tile_size, 0);
>  
>  			gtt_offset_rotated += rot_info->plane[i].width * rot_info->plane[i].height;
> -- 
> 2.5.5

-- 
Ville Syrjälä
Intel OTC
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