[Intel-gfx] [PATCH v2] drm/i915: Don't clobber crtc->fb when queue_flip fails

[Mika Kuoppala]

ville.syrjala at linux.intel.com writes:

> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Restore crtc->fb to the old framebuffer if queue_flip fails.
>
> While at it, kill the pointless intel_fb temp variable.
>
> v2: Update crtc->fb before queue_flip and restore it back
>     after a failure.
>
> Cc: stable at vger.kernel.org
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Tested-by: Mika Kuoppala <mika.kuoppala at intel.com>