On Tue, 2023-10-24 at 15:47 +0100, Paul Durrant wrote:
> 
> >    
> > -    if (netdev->xendev.be_state != XenbusStateConnected) {
> > +    if (netdev->rx_ring.sring == NULL) {
> 
> Why not a straight swap for xen_device_backend_get_state()? Hard to see 
> whether there any hidden side effects of this change otherwise.

I suppose if I litter it with a few assertions that the iothread mutex
is locked, I can live with that. As long as it's atomic w.r.t.
disconnection, they *are* identical checks.

(And if it could be running simultaneously with disconnection, we'd be
hosed anyway).

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