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

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Message-ID: <20110118235401.GA16219@lst.de>
Date:	Wed, 19 Jan 2011 00:54:01 +0100
From:	Christoph Hellwig <hch@....de>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_blk: allow re-reading config space at runtime

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.

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