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ehci: Fix interrupts stopping when Interrupt Threshold Control is 8 

If Interrupt Threshold Control is 8 or a multiple of 8, then
s->usbsts_frindex can become exactly 0x4000, at which point
(s->usbsts_frindex > s->frindex) will never become true, as
s->usbsts_frindex will not be lowered / reset in this case.

This patch fixes this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit ffa1f2e088)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Hans de Goede 2012-09-10 12:44:10 +02:00 committed by Michael Roth
parent 1f97f6c9fe
commit 29ecaa26a8
1 changed files with 1 additions and 1 deletions
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2
hw/usb/hcd-ehci.c
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@ -2413,7 +2413,7 @@ static void ehci_update_frindex(EHCIState *ehci, int frames)
if (ehci->frindex == 0x00004000) { if (ehci->frindex == 0x00004000) {
ehci_raise_irq(ehci, USBSTS_FLR); ehci_raise_irq(ehci, USBSTS_FLR);
ehci->frindex = 0; ehci->frindex = 0;
if (ehci->usbsts_frindex > 0x00004000) { if (ehci->usbsts_frindex >= 0x00004000) {
ehci->usbsts_frindex -= 0x00004000; ehci->usbsts_frindex -= 0x00004000;
} else { } else {
ehci->usbsts_frindex = 0; ehci->usbsts_frindex = 0;