[PATCH] USB: ehci fix driver model wakeup flags

On some systems, EHCI seems to be getting IRQs too early during driver
setup ... before the root hub is allocated, in particular, making trouble
for any code chasing down root hub pointers!  In this case, it seems to
be safe to just ignore the root hub setting.  Thanks to Rafael J. Wysocki
for getting this properly tested.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-hcd.c

@@ -624,7 +624,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd, struct pt_regs *regs)
 	}
 
 	/* remote wakeup [4.3.1] */
-	if ((status & STS_PCD) && device_may_wakeup(&hcd->self.root_hub->dev)) {
+	if (status & STS_PCD) {
 		unsigned	i = HCS_N_PORTS (ehci->hcs_params);
 
 		/* resume root hub? */