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usb-uhci: stop queue filling when we find a in-flight td

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Not only QHs can form rings, but TDs too.  With the new
queuing/pipelining support we are following TD chains and
can actually walk in circles.  An assert() prevents us from
entering an endless loop then.

Fix is easy:  Just stop queuing when we figure the TD we are
about to queue up is in flight already.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-03-21 18:25:25 +01:00
parent eeb0cf9abf
commit 52b0fecdba
1 changed files with 3 additions and 0 deletions
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3
hw/usb/hcd-uhci.c
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@ -965,6 +965,9 @@ static void uhci_fill_queue(UHCIState *s, UHCI_TD *td)
}
trace_usb_uhci_td_queue(plink & ~0xf, ptd.ctrl, ptd.token);
ret = uhci_handle_td(s, plink, &ptd, &int_mask);
if (ret == TD_RESULT_ASYNC_CONT) {
break;
}
assert(ret == TD_RESULT_ASYNC_START);
assert(int_mask == 0);
plink = ptd.link;