linux-kernel - Re: [PATCH] drm/i915: Flush writes to GMBUS registers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130318124841.GA3995@cantiga.alporthouse.com>
Date:	Mon, 18 Mar 2013 12:48:41 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	Shawn Starr <shawn.starr@...ers.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH] drm/i915: Flush writes to GMBUS registers

On Mon, Mar 18, 2013 at 12:51:45PM +0100, Jiri Kosina wrote:
> On Mon, 18 Mar 2013, Chris Wilson wrote:
> 
> > If we do not complete the writes to the GMBUS registers, they remain
> > active for an indefinite period of time afterwards, even causing
> > spurious interrupts on gm45.
> > 
> > Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> > Link: http://lkml.kernel.org/r/alpine.LNX.2.00.1303151424140.9529@pobox.suse.cz
> > Cc: Shawn Starr <shawn.starr@...ers.com>
> > Cc: Jiri Kosina <jkosina@...e.cz>
> > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> 
> Unfortunately I can't provide my Tested-by or Acked-by for this, as I am 
> still seeing the "nobody cared" for irq 16 with this patch applied.

The message reappeared on the third reboot. Perhaps an indicator that it
is a timing issue. I guess the sensible approach then is to exclude gen4
from the whitelist for gmbus irqs.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/