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ehci: Better detection for qtd-s linked in circles

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Windows links interrupt qtd-s in circles, which means that when interrupt
endpoints return USB_RET_ASYNC, combined with the recent
"ehci: Retry to fill the queue while waiting for td completion" patch,
we keep adding the tds to the queue over and over again, as we detect the
circle from fill_queue, but we call it over and over again ...

This patch fixes this by changing the circle detection to also detect
circling into tds already queued up previously.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2012-11-14 17:21:38 +01:00 committed by Gerd Hoffmann
parent ff80ce599e
commit 601a234731
1 changed files with 6 additions and 3 deletions
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9
hw/usb/hcd-ehci.c
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@ -1790,7 +1790,7 @@ static int ehci_fill_queue(EHCIPacket *p)
USBEndpoint *ep = p->packet.ep;
EHCIQueue *q = p->queue;
EHCIqtd qtd = p->qtd;
uint32_t qtdaddr, start_addr = p->qtdaddr;
uint32_t qtdaddr;
for (;;) {
if (NLPTR_TBIT(qtd.next) != 0) {
@ -1801,8 +1801,10 @@ static int ehci_fill_queue(EHCIPacket *p)
* Detect circular td lists, Windows creates these, counting on the
* active bit going low after execution to make the queue stop.
*/
if (qtdaddr == start_addr) {
break;
QTAILQ_FOREACH(p, &q->packets, next) {
if (p->qtdaddr == qtdaddr) {
goto leave;
}
}
get_dwords(q->ehci, NLPTR_GET(qtdaddr),
(uint32_t *) &qtd, sizeof(EHCIqtd) >> 2);
@ -1819,6 +1821,7 @@ static int ehci_fill_queue(EHCIPacket *p)
assert(p->packet.status == USB_RET_ASYNC);
p->async = EHCI_ASYNC_INFLIGHT;
}
leave:
usb_device_flush_ep_queue(ep->dev, ep);
return 1;
}