USB: suspend support for usb serial

this implements generic support for suspend/resume for usb serial.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 4f8282ad7720..b90ef3f70f4c 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -69,6 +69,7 @@ struct usb_serial_driver usb_serial_generic_device = {
         .shutdown =             usb_serial_generic_shutdown,
         .throttle =             usb_serial_generic_throttle,
         .unthrottle =           usb_serial_generic_unthrottle,
+        .resume =               usb_serial_generic_resume,
 };
 
 static int generic_probe(struct usb_interface *interface,
@@ -169,6 +170,23 @@ static void generic_cleanup (struct usb_serial_port *port)
         }
 }
 
+int usb_serial_generic_resume(struct usb_serial *serial)
+{
+        struct usb_serial_port *port;
+        int i, c = 0, r;
+
+        for (i = 0; i < serial->num_ports; i++) {
+                port = serial->port[i];
+                if (port->open_count && port->read_urb) {
+                        r = usb_submit_urb(port->read_urb, GFP_NOIO);
+                        if (r < 0)
+                                c++;
+                }
+        }
+
+        return c ? -EIO : 0;
+}
+
 void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp)
 {
         dbg("%s - port %d", __FUNCTION__, port->number);