From c84ed39e601ff69d93e0ad81d92cb7234ad5d4cd Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 10 Sep 2012 12:44:10 +0200 Subject: [PATCH] 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 Signed-off-by: Gerd Hoffmann (cherry picked from commit ffa1f2e088eb7e3d57f2fc35f21e7bdb23e592c5) Signed-off-by: Michael Roth --- hw/usb/hcd-ehci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c index f5ba8e1..54273d7 100644 --- a/hw/usb/hcd-ehci.c +++ b/hw/usb/hcd-ehci.c @@ -2413,7 +2413,7 @@ static void ehci_update_frindex(EHCIState *ehci, int frames) if (ehci->frindex == 0x00004000) { ehci_raise_irq(ehci, USBSTS_FLR); ehci->frindex = 0; - if (ehci->usbsts_frindex > 0x00004000) { + if (ehci->usbsts_frindex >= 0x00004000) { ehci->usbsts_frindex -= 0x00004000; } else { ehci->usbsts_frindex = 0;