[PATCH xf86-video-ati] Use correct ScrnInfoPtr in redisplay_dirty

[Alexander.Deucher@xxxxxxx (Deucher, Alexander)]

> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf
> Of Michel Dänzer
> Sent: Wednesday, November 15, 2017 12:10 PM
> To: amd-gfx at lists.freedesktop.org
> Subject: [PATCH xf86-video-ati] Use correct ScrnInfoPtr in redisplay_dirty
> 
> From: Michel Dänzer <michel.daenzer at amd.com>
> 
> We used the destination pixmap's screen for flushing drawing commands.
> But when we are the master screen, the destination pixmap is from the
> slave screen.
> 
> Fixes crash when the slave screen isn't using the same acceleration
> architecture as us.
> 
> Bugzilla: https://bugs.freedesktop.org/103613
> Fixes: 01b040b4a807 ("Adapt to PixmapDirtyUpdateRec::src being a
>                      DrawablePtr")
> (Ported from amdgpu commit
> 3a4f7422913093ed9e26b73ecd7f9e773478cb1e)
> 
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

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

> ---
>  src/radeon_kms.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/src/radeon_kms.c b/src/radeon_kms.c
> index 06c8a47fb..5fcd8f0b7 100644
> --- a/src/radeon_kms.c
> +++ b/src/radeon_kms.c
> @@ -570,7 +570,11 @@ dirty_region(PixmapDirtyUpdatePtr dirty)
>  static void
>  redisplay_dirty(PixmapDirtyUpdatePtr dirty, RegionPtr region)
>  {
> -	ScrnInfoPtr pScrn = xf86ScreenToScrn(dirty->slave_dst-
> >drawable.pScreen);
> +#ifdef HAS_DIRTYTRACKING_DRAWABLE_SRC
> +	ScrnInfoPtr src_scrn = xf86ScreenToScrn(dirty->src->pScreen);
> +#else
> +	ScrnInfoPtr src_scrn = xf86ScreenToScrn(dirty->src-
> >drawable.pScreen);
> +#endif
> 
>  	if (RegionNil(region))
>  		goto out;
> @@ -584,7 +588,7 @@ redisplay_dirty(PixmapDirtyUpdatePtr dirty,
> RegionPtr region)
>  	PixmapSyncDirtyHelper(dirty, region);
>  #endif
> 
> -	radeon_cs_flush_indirect(pScrn);
> +	radeon_cs_flush_indirect(src_scrn);
>  	if (dirty->slave_dst->master_pixmap)
>  	    DamageRegionProcessPending(&dirty->slave_dst->drawable);
> 
> --
> 2.15.0
> 
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