linux-kernel - Re: Extending virtio_console to support multiple ports

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Message-ID: <20090827100809.5f0aa0a7@linux.intel.com>
Date:	Thu, 27 Aug 2009 10:08:09 +0100
From:	Alan Cox <alan@...ux.intel.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Amit Shah <amit.shah@...hat.com>, qemu-devel@...gnu.org,
	kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
	borntraeger@...ibm.com, linux-kernel@...r.kernel.org,
	miltonm@....com, linuxppc-dev@...abs.org,
	brueckner@...ux.vnet.ibm.com
Subject: Re: Extending virtio_console to support multiple ports

>  - 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.

Alan
 

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