linux-kernel - Re: [PATCH 1/2] macvtap: rework object lifetime rules

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Date:	Mon, 15 Feb 2010 15:48:40 -0800
From:	Ed Swierk <eswierk@...stanetworks.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>,
	Sridhar Samudrala <sri@...ibm.com>, qemu-devel@...gnu.org,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH 1/2] macvtap: rework object lifetime rules

On Sat, Feb 13, 2010 at 2:33 AM, Arnd Bergmann <arnd@...db.de> wrote:
> The original macvtap code has a number of problems
> resulting from the use of RCU for protecting the
> access to struct macvtap_queue from open files.
>
> This includes
> - need for GFP_ATOMIC allocations for skbs
> - potential deadlocks when copy_*_user sleeps
> - inability to work with vhost-net
>
> Changing the lifetime of macvtap_queue to always
> depend on the open file solves all these. The
> RCU reference simply moves one step down to
> the reference on the macvlan_dev, which we
> only need for nonblocking operations.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

This works for me.

Acked-by: Ed Swierk <eswierk@...stanetworks.com>
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