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Date:   Fri, 23 Dec 2016 07:51:21 +0000
From:   Chris Wilson <>
Subject: Re: [Intel-gfx] [PATCH] drm/i915: check if execlist_port is empty
 before using its content

On Fri, Dec 23, 2016 at 01:46:36PM +0800, wrote:
> From: "Du, Changbin" <>
> 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 Wilson, Intel Open Source Technology Centre

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