linux-kernel - Re: 3.8-rc2: EFI framebuffer lock inversion...

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Message-ID: <20130103131156.214bd7a5@pyramind.ukuu.org.uk>
Date:	Thu, 3 Jan 2013 13:11:56 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Daniel J Blueman <daniel@...ra.org>
Cc:	Peter Jones <pjones@...hat.com>, linux-fbdev@...r.kernel.org,
	nouveau@...ts.freedesktop.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org
Subject: Re: 3.8-rc2: EFI framebuffer lock inversion...

On Thu, 3 Jan 2013 20:56:30 +0800
Daniel J Blueman <daniel@...ra.org> wrote:

> On 3.8-rc2 with lockdep enabled and dual-GPU setup (Macbook Pro
> Retina), I see two releated lock inversion issues with the EFI
> framebuffer, leading to possible deadlock: when X takes over from the
> EFI framebuffer [1] and when nouveau releases the framebuffer when
> being vgaswitcherood [2].
> 
> Let me know if you'd like any testing or analysis when I can get the time.

The fb layer locking was broken. I posted patches early December which
should have fixed the ones we know about. ('fb: Rework locking to fix
lock ordering on takeover').

Alan
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