tree b5f0631172db5d97e0a5c6b8a6bc0f83c4a4eed5
parent a6c372de6e4b9a8188b66badcee3e3792eccdd26
author Rusty Russell <rusty@rustcorp.com.au> 1244867221 -0600
committer Rusty Russell <rusty@rustcorp.com.au> 1244811422 +0930

lguest: remove invalid interrupt forcing logic.

20887611523e749d99cc7d64ff6c97d27529fbae (lguest: notify on empty) introduced
lguest support for the VIRTIO_F_NOTIFY_ON_EMPTY flag, but in fact it turned on
interrupts all the time.

Because we always process one buffer at a time, the inflight count is always 0
when call trigger_irq and so we always ignore VRING_AVAIL_F_NO_INTERRUPT from
the Guest.

It should be looking to see if there are more buffers in the Guest's queue:
if it's empty, then we force an interrupt.

This makes little difference, since we usually have an empty queue; but
that's the subject of another patch.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>