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Blame 0129-usb-ehci-always-call-ehci_queues_rip_unused-for-peri.patch

Hans de Goede 1b1995
From 320063f7165c5a5f9ddd5a09a4663bc1a81f5bd6 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Fri, 2 Mar 2012 13:52:44 +0100
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Subject: [PATCH 129/140] usb-ehci: always call ehci_queues_rip_unused for
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 period queues
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Before this patch USB 2 devices with interrupt endpoints were not working
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properly. The problem is that to avoid loops we stop processing as soon
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as we encounter a queue-head (qh) we've already seen since qhs can be linked
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in a circular fashion, this is tracked by the seen flag in our qh struct.
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The resetting of the seen flag is done from ehci_queues_rip_unused which
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before this patch was only called when executing the statemachine for the
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async schedule.
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But packets for interrupt endpoints are part of the periodic schedule! So what
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would happen is that when there were no ctrl or bulk packets for a USB 2
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device with an interrupt endpoint, the async schedule would become non
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active, then ehci_queues_rip_unused would no longer get called and when
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processing the qhs for the interrupt endpoints from the periodic schedule
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their seen bit would still be 1 and they would be skipped.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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 hw/usb-ehci.c |    1 +
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 1 file changed, 1 insertion(+)
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diff --git a/hw/usb-ehci.c b/hw/usb-ehci.c
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index 980cce3..422afc8 100644
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--- a/hw/usb-ehci.c
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+++ b/hw/usb-ehci.c
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@@ -2195,6 +2195,7 @@ static void ehci_advance_periodic_state(EHCIState *ehci)
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         ehci_set_fetch_addr(ehci, async,entry);
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         ehci_set_state(ehci, async, EST_FETCHENTRY);
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         ehci_advance_state(ehci, async);
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+        ehci_queues_rip_unused(ehci, async, 0);
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         break;
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     default:
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-- 
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1.7.9.3
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