Linux Virtualization - Sep 2018 - [RFC PATCH 2/2] virtio/s390: fix race in ccw_io_helper()

On Wed, 19 Sep 2018 18:56:45 +0200
Halil Pasic <pasic at linux.ibm.com> wrote:
> On 09/19/2018 04:07 PM, Cornelia Huck wrote:
> > Do you spot any other places where we may need to care about
concurrent
> > processing (like for the ->config area in the previous patch)?
> >   
> 
> It is hard to tell, because:
> * Synchronization external to the transport could make things work
> out just fine.
> * virtio_config_ops does not document these requirements if any.
> * So it's up to the devices to use the stuff without shooting
>   themselves in the foot.
> * virtio-pci does not seem to do more to avoid such problems that
>   we do.
> 
> Back then when learning vritio-ccw I did ask myself such questions
> and based on vrito-pci and I was like looks similar, should be
> good enough.
Yep, I agree. If there's nothing obvious, I think we should just leave
it as it is now.