[PATCH 1/1] usb: serial: Fix mos7840 resume from standby

[Dmitry <d.smirnov@xxxxxxxx>]

From: Dmitry <dimonija@xxxxxxxxx>

---
 drivers/usb/serial/mos7840.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 8b0308d84270..7443d2f018b4 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -770,6 +770,7 @@ static void mos7840_close(struct usb_serial_port *port)
 		if (mos7840_port->write_urb_pool[j]) {
 			kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
 			usb_free_urb(mos7840_port->write_urb_pool[j]);
+			mos7840_port->write_urb_pool[j] = NULL;
 		}
 	}
 
@@ -1737,6 +1738,37 @@ static void mos7840_port_remove(struct usb_serial_port *port)
 	kfree(mos7840_port);
 }
 
+static int mos7840_suspend(struct usb_serial *serial, pm_message_t message)
+{
+    dev_dbg(&serial->interface->dev, "mos7840_suspend\n");
+
+    return 0;
+}
+
+static int mos7840_resume(struct usb_serial *serial)
+{
+	struct moschip_port *mos7840_port;
+	struct usb_serial_port *port;
+	int i;
+	dev_dbg(&serial->interface->dev, "mos7840_resume\n");
+
+	for (i = 0; i < serial->num_ports; ++i) {
+		port = serial->port[i];
+		if (!tty_port_initialized(&port->port))
+			continue;
+
+		mos7840_port = usb_get_serial_port_data(port);
+
+		if (port->bulk_in_size)
+			usb_submit_urb(mos7840_port->read_urb, GFP_NOIO);
+
+		/*if (port->bulk_out_size)
+			usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);*/
+	}
+
+    return 0;
+}
+
 static struct usb_serial_driver moschip7840_4port_device = {
 	.driver = {
 		   .owner = THIS_MODULE,
@@ -1764,6 +1796,8 @@ static struct usb_serial_driver moschip7840_4port_device = {
 	.port_probe = mos7840_port_probe,
 	.port_remove = mos7840_port_remove,
 	.read_bulk_callback = mos7840_bulk_in_callback,
+	.suspend = mos7840_suspend,
+	.resume = mos7840_resume,
 };
 
 static struct usb_serial_driver * const serial_drivers[] = {
-- 
2.45.1