[media] dvb_usb_v2: suspend/resume stop/start USB streaming

Stop remote polling and USB streaming before suspend and resume
those when back to normal operation.

It is far away from complete implementation, but at least it does
not hang system anymore on suspend while streaming is ongoing.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/dvb_usb.h

@@ -356,6 +356,8 @@ struct dvb_usb_device {
 extern int dvb_usbv2_probe(struct usb_interface *,
 		const struct usb_device_id *);
 extern void dvb_usbv2_disconnect(struct usb_interface *);
+extern int dvb_usbv2_suspend(struct usb_interface *, pm_message_t);
+extern int dvb_usbv2_resume(struct usb_interface *);
 
 /* the generic read/write method for device control */
 extern int dvb_usbv2_generic_rw(struct dvb_usb_device *, u8 *, u16, u8 *, u16,

drivers/media/dvb/dvb-usb/dvb_usb_init.c

@@ -439,6 +439,49 @@ void dvb_usbv2_disconnect(struct usb_interface *intf)
 }
 EXPORT_SYMBOL(dvb_usbv2_disconnect);
 
+int dvb_usbv2_suspend(struct usb_interface *intf, pm_message_t msg)
+{
+	struct dvb_usb_device *d = usb_get_intfdata(intf);
+	int i;
+
+	pr_debug("%s:\n", __func__);
+
+	/* stop remote controller poll */
+	if (d->rc.query && !d->rc.bulk_mode)
+		cancel_delayed_work_sync(&d->rc_query_work);
+
+	/* stop streaming */
+	for (i = d->num_adapters_initialized - 1; i >= 0; i--) {
+		if (d->adapter[i].active_fe != -1)
+			usb_urb_killv2(&d->adapter[i].stream);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(dvb_usbv2_suspend);
+
+int dvb_usbv2_resume(struct usb_interface *intf)
+{
+	struct dvb_usb_device *d = usb_get_intfdata(intf);
+	int i;
+
+	pr_debug("%s:\n", __func__);
+
+	/* start streaming */
+	for (i = 0; i < d->num_adapters_initialized; i++) {
+		if (d->adapter[i].active_fe != -1)
+			usb_urb_submitv2(&d->adapter[i].stream, NULL);
+	}
+
+	/* start remote controller poll */
+	if (d->rc.query && !d->rc.bulk_mode)
+		schedule_delayed_work(&d->rc_query_work,
+				msecs_to_jiffies(d->rc.interval));
+
+	return 0;
+}
+EXPORT_SYMBOL(dvb_usbv2_resume);
+
 MODULE_VERSION("1.0");
 MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@desy.de>");
 MODULE_DESCRIPTION("A library module containing commonly used USB and DVB function USB DVB devices");