Re: [PATCH RFC] virtio_blk: fix config handler race

[Rusty Russell]

On Wed, 7 Dec 2011 17:39:02 +0200, "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:
> Fix a theoretical race related to config work
> handler: a config interrupt might happen
> after we flush config work but before we
> reset the device. It will then cause the
> config work to run during or after reset.

Thanks for the reminder.  Apologies that this slipped through :(

> As a solution
> 1. flush after reset when we know there will be no more interrupts
> 2. add a flag to disable config access before reset

It's crude, but it works.  Applied.

If this happens again, do we want a "__virtio_device_disable" which
stops any interrupts from being delivered?  That would make this neater,
though the implementation might be a bit nasty.

Thanks,
Rusty.
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