linux-kernel - Re: [PATCH RFC] virtio-net: remove useless disable on freeze

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Date:	Thu, 3 May 2012 14:08:45 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH RFC] virtio-net: remove useless disable on freeze

On Thu, May 03, 2012 at 04:29:59PM +0530, Amit Shah wrote:
> On (Wed) 04 Apr 2012 [12:19:55], Michael S. Tsirkin wrote:
> > disable_cb is just an optimization: it
> > can not guarantee that there are no callbacks.
> 
> Even then, what's the harm in keeping it?  If indeed there's an
> attempt to raise an interrupt after the host has been notified, it
> will be suppressed.

It won't. It's not a guarantee, e.g. with event index on
it does nothing at all.

> Also, disable_cb seems to be used elsewhere in the virtio_net.c file,
> to suit similar purposes.
> 
> 		Amit

Where?
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