usbcore: suspending devices with no driver

Since usb_generic can be unbound from a USB device, we need to be able
to handle the possibility that a suspend or resume request arrives for a
device with no driver.  This patch (as735) arranges things so that
resume requests will fail and suspend requests will use the standard USB
port-suspend code.  Attempts to suspend or resume an unbound interface
are handled similarly (although the error caused by trying to resume an
unbound interface is dropped by the calling routine).
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/driver.c

@@ -761,8 +761,12 @@ static int suspend_device(struct usb_device *udev, pm_message_t msg)
 			udev->state == USB_STATE_SUSPENDED)
 		goto done;
 
-	if (udev->dev.driver == NULL)
+	/* For devices that don't have a driver, we do a standard suspend. */
+	if (udev->dev.driver == NULL) {
+		status = usb_port_suspend(udev);
 		goto done;
+	}
+
 	udriver = to_usb_device_driver(udev->dev.driver);
 	status = udriver->suspend(udev, msg);
 
@@ -782,8 +786,12 @@ static int resume_device(struct usb_device *udev)
 			udev->state != USB_STATE_SUSPENDED)
 		goto done;
 
-	if (udev->dev.driver == NULL)
+	/* Can't resume it if it doesn't have a driver. */
+	if (udev->dev.driver == NULL) {
+		status = -ENOTCONN;
 		goto done;
+	}
+
 	udriver = to_usb_device_driver(udev->dev.driver);
 	status = udriver->resume(udev);
 
@@ -804,7 +812,7 @@ static int suspend_interface(struct usb_interface *intf, pm_message_t msg)
 			!is_active(intf))
 		goto done;
 
-	if (intf->dev.driver == NULL)
+	if (intf->dev.driver == NULL)		/* This can't happen */
 		goto done;
 	driver = to_usb_driver(intf->dev.driver);
 
@@ -838,8 +846,11 @@ static int resume_interface(struct usb_interface *intf)
 			is_active(intf))
 		goto done;
 
-	if (intf->dev.driver == NULL)
+	/* Can't resume it if it doesn't have a driver. */
+	if (intf->dev.driver == NULL) {
+		status = -ENOTCONN;
 		goto done;
+	}
 	driver = to_usb_driver(intf->dev.driver);
 
 	if (driver->resume) {