linux-kernel - Re: [Qemu-devel] Re: Extending virtio

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Message-ID: <20090829011517.GG8036@shareable.org>
Date:	Sat, 29 Aug 2009 02:15:17 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kvm@...r.kernel.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, miltonm@....com,
	qemu-devel@...gnu.org, borntraeger@...ibm.com,
	brueckner@...ux.vnet.ibm.com, Amit Shah <amit.shah@...hat.com>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [Qemu-devel] Re: Extending virtio_console to support multiple ports

Alan Cox wrote:
> >  - Then, are we certain that there's no case where the tty layer will
> > call us with some lock held or in an atomic context ? To be honest,
> > I've totally lost track of the locking rules in tty land lately so it
> > might well be ok, but something to verify.
> 
> Some of the less well behaved line disciplines do this and always have
> done.

I had a backtrace in my kernel log recently which looked like that,
while doing PPP over Bluetooth RFCOMM.  Resulted in AppArmor
complaining that it's hook was being called in irq context.

-- Jamie
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