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ehci: Set int flag on a short input packet 

According to 4.15.1.2 an interrupt must be raised when a short packet
is received. If we don't do this it may take a significant time for
the guest to notice a short trasnfer has completed, since only the last td
will have its IOC flag set, and a short transfer may complete in an earlier
packet.

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 2012-10-24 18:14:00 +02:00 committed by Gerd Hoffmann
parent 549a3c3d96
commit cf08a8a1f6
1 changed files with 4 additions and 0 deletions
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4
hw/usb/hcd-ehci.c
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@ -1508,6 +1508,10 @@ static void ehci_execute_complete(EHCIQueue *q)
if (tbytes && p->pid == USB_TOKEN_IN) { if (tbytes && p->pid == USB_TOKEN_IN) {
tbytes -= p->usb_status; tbytes -= p->usb_status;
if (tbytes) {
/* 4.15.1.2 must raise int on a short input packet */
ehci_raise_irq(q->ehci, USBSTS_INT);
}
} else { } else {
tbytes = 0; tbytes = 0;
} }