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

From: Alan Cox
Date: Thu Jan 03 2013 - 08:05:11 EST

On Thu, 3 Jan 2013 20:56:30 +0800
Daniel J Blueman <daniel@xxxxxxxxx> 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').

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