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

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Message-ID: <0C18FE92A7765D4EB9EE5D38D86A563A53A9C855@SHSMSX103.ccr.corp.intel.com>
Date:   Mon, 26 Dec 2016 07:41:36 +0000
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
CC:     "Vetter, Daniel" <daniel.vetter@...el.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.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
> 
Thanks, I will restudy the code after process my current job. Since this happen
on gvt guest, so this may related to gvt emulation.

> --
> Chris Wilson, Intel Open Source Technology Centre