Hello,
> > > > + if (prod - out_cons >= XENFB_OUT_RING_LEN) {
> > > > + return;
> > > > + }
This test seems overzealous to me: AIUI, the producer can produce
XENFB_OUT_RING_LEN events, and thus prod - out_cons is exactly
XENFB_OUT_RING_LEN, i.e. there is no room left at all.
The frontend part is:
while (page->out_prod - page->out_cons == XENFB_OUT_RING_LEN)
schedule();
I.e. it waits while the buffer is exactly full.
So it seems to me the bug is at the backend side.
Samuel
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