linux-kernel - Re: [PATCH] fb: Rework locking to fix lock ordering on takeover

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Date:	Tue, 15 Jan 2013 15:12:39 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Maarten Lankhorst <m.b.lankhorst@...il.com>
Cc:	Borislav Petkov <bp@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Shawn Guo <shawn.guo@...aro.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Josh Boyer <jwboyer@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Tobias Schandinat <florianSchandinat@....de>
Subject: Re: [PATCH] fb: Rework locking to fix lock ordering on takeover

> Just tested this patch on a macbook pro with i915 and radeon. First I get a nasty lockdep splat, then it locks up completely:
> 
> [   13.507373] fb: conflicting fb hw usage radeondrmfb vs EFI VGA - removing generic driver

The EFI driver is known to need other work of its own.

Alan
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