From: Wu Zhangjin <wuzj@lemote.com>
Date: Mon, 4 Jan 2010 11:33:02 +0800
Subject: USB: Fix the mouse problem when copying large amounts of data

When copying large amounts of data between the USB storage devices and
the hard disk, the USB mouse will not work, this patch fixes it.

[NOTE: This problem have been found in the Loongson family machines, not
sure whether it is producible on other platforms]

Signed-off-by: Hu Hongbing <huhb@lemote.com>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>

---
 drivers/usb/host/ohci-hcd.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Index: linux-stable/drivers/usb/host/ohci-hcd.c
===================================================================
--- linux-stable.orig/drivers/usb/host/ohci-hcd.c
+++ linux-stable/drivers/usb/host/ohci-hcd.c
@@ -829,9 +829,13 @@ static irqreturn_t ohci_irq (struct usb_
 	}
 
 	if (ints & OHCI_INTR_WDH) {
-		spin_lock (&ohci->lock);
-		dl_done_list (ohci);
-		spin_unlock (&ohci->lock);
+		if (ohci->hcca->done_head == 0) {
+			ints &= ~OHCI_INTR_WDH;
+		} else {
+			spin_lock (&ohci->lock);
+			dl_done_list (ohci);
+			spin_unlock (&ohci->lock);
+		}
 	}
 
 	if (quirk_zfmicro(ohci) && (ints & OHCI_INTR_SF)) {