[Intel-gfx] [PATCH] drm/i915: check if execlist_port is empty before using its content

[Chris Wilson]

On Fri, Dec 23, 2016 at 01:46:36PM +0800, changbin.du at intel.com wrote:
> From: "Du, Changbin" <changbin.du at intel.com>
> 
> This patch fix a crash in function reset_common_ring. In this case,
> the port[0].request is null when reset the render ring, so a null
> dereference exception is raised. We need to check execlist_port status
> first.

No. The root cause is whatever got you into the illegal condition in the
first place.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre