Re: [PATCH] virtio_blk: allow re-reading config space at runtime

[Michael S. Tsirkin]

On Wed, Jan 19, 2011 at 12:54:01AM +0100, Christoph Hellwig wrote:
> On Wed, Jan 19, 2011 at 09:56:09AM +1030, Rusty Russell wrote:
> > > I don't think we have much choice.  We're getting called from irq
> > > context, so we'll need to allocate memory to offload things.  That's
> > > unless we keep a thread around that we just need to wake up, which
> > > would be a huge waste of ressources.
> > 
> > Yes, but can we keep a workqueue struct around?
> 
> We can keep one around, but we can't prevent the virtio core code from
> calling us again while it's still in use.

Yes but in that specific situation (double schedule before
it runs once) discarding one change notification
would not hurt at all.

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