diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 22756db..eff2dfd 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -330,6 +330,12 @@ next_desc:
 	if (status < 0 && info->control != info->data) {
 		usb_set_intfdata(info->data, NULL);
 		usb_driver_release_interface(driver, info->data);
+	} else {
+		/* Clearing an endpoint halt brings some Sierra devices (MC7355)
+		 * out of low-power mode.
+		 */
+		printk(KERN_INFO "%s: clearing halt\n", __func__);
+		usb_clear_halt(dev->udev, dev->out);
 	}
 
 	/* Never use the same address on both ends of the link, even
diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
index b2aa003..127f192 100644
--- a/drivers/usb/serial/qcserial.c
+++ b/drivers/usb/serial/qcserial.c
@@ -330,6 +331,23 @@ static void qc_release(struct usb_serial *serial)
 	kfree(priv);
 }
 
+int qc_port_probe(struct usb_serial_port *port)
+{
+	int retval;
+
+	retval = usb_wwan_port_probe(port);
+	if (retval == 0) {
+		printk(KERN_INFO "%s: clearing halt\n", __func__);
+		/* Clearing an endpoint halt brings some Sierra devices (MC7355)
+		 * out of low-power mode.
+		 */
+		usb_clear_halt(port->serial->dev,
+			       usb_sndbulkpipe(port->serial->dev,
+					       port->bulk_out_endpointAddress));
+	}
+	return retval;
+}
+
 static struct usb_serial_driver qcdevice = {
 	.driver = {
 		.owner     = THIS_MODULE,
@@ -346,7 +364,7 @@ static struct usb_serial_driver qcdevice = {
 	.chars_in_buffer     = usb_wwan_chars_in_buffer,
 	.attach              = qc_attach,
 	.release	     = qc_release,
-	.port_probe          = usb_wwan_port_probe,
+	.port_probe          = qc_port_probe,
 	.port_remove	     = usb_wwan_port_remove,
 #ifdef CONFIG_PM
 	.suspend	     = usb_wwan_suspend,