UHCI: fix port resume problem

This patch (as863) fixes a problem encountered sometimes when resuming
a port on a UHCI controller. The hardware may turn off the
Resume-Detect bit before turning off the Suspend bit, leading usbcore
to think that the port is still suspended and the resume has failed.
The patch makes uhci_finish_suspend() wait until both bits are safely
off.

Signed-off-by: Alan Stern <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/uhci-hub.c

···
 /* status change bits:  nonzero writes will clear */
 #define RWC_BITS	(USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)
 
+/* suspend/resume bits: port suspended or port resuming */
+#define SUSPEND_BITS	(USBPORTSC_SUSP | USBPORTSC_RD)
+
 /* A port that either is connected or has a changed-bit set will prevent
  * us from AUTO_STOPPING.
  */
···
 	int status;
 	int i;
 
-	if (inw(port_addr) & (USBPORTSC_SUSP | USBPORTSC_RD)) {
-		CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD);
+	if (inw(port_addr) & SUSPEND_BITS) {
+		CLR_RH_PORTSTAT(SUSPEND_BITS);
 		if (test_bit(port, &uhci->resuming_ports))
 			set_bit(port, &uhci->port_c_suspend);
 
···
 		 * Experiments show that some controllers take longer, so
 		 * we'll poll for completion. */
 		for (i = 0; i < 10; ++i) {
-			if (!(inw(port_addr) & USBPORTSC_RD))
+			if (!(inw(port_addr) & SUSPEND_BITS))
 				break;
 			udelay(1);
 		}
···
 			wPortStatus |= USB_PORT_STAT_CONNECTION;
 		if (status & USBPORTSC_PE) {
 			wPortStatus |= USB_PORT_STAT_ENABLE;
-			if (status & (USBPORTSC_SUSP | USBPORTSC_RD))
+			if (status & SUSPEND_BITS)
 				wPortStatus |= USB_PORT_STAT_SUSPEND;
 		}
 		if (status & USBPORTSC_OC)