linux-kernel - Re: [PATCH] mutex: fix deadlock injection

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Message-ID: <5201E7B0.5070802@canonical.com>
Date:	Wed, 07 Aug 2013 08:22:40 +0200
From:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
To:	Dave Airlie <airlied@...il.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH] mutex: fix deadlock injection

Op 07-08-13 02:05, Dave Airlie schreef:
> On Tue, Jul 30, 2013 at 6:41 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>> On Tue, Jul 30, 2013 at 10:13:41AM +0200, Maarten Lankhorst wrote:
>>> The check needs to be for > 1, because ctx->acquired is already incremented.
>>> This will prevent ww_mutex_lock_slow from returning -EDEADLK and not locking
>>> the mutex. It caused a lot of false gpu lockups on radeon with
>>> CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y because a function that shouldn't be able
>>> to return -EDEADLK did.
>>>
>>> Cc: Alex Deucher <alexander.deucher@....com>
>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...onical.com>
> Should this be merged via Ingo? or will I queue it in my -fixes?
>
> Dave.
>
It's in tip:core/urgent, so I imagine you don't need to queue it.
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