linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: check if execlist

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Date:   Fri, 23 Dec 2016 07:51:21 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     changbin.du@...el.com
Cc:     daniel.vetter@...el.com, airlied@...ux.ie,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
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, changbin.du@...el.com wrote:
> From: "Du, Changbin" <changbin.du@...el.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