USB: serial: use generic method if no alternative is provided in usb serial layer

This patch makes use of the generic method if a serial driver provides
no implementation. This simplifies implementing suspend/resume support
in serial drivers.

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

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index c6aaa6dc7564..18f940847316 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1085,12 +1085,15 @@ EXPORT_SYMBOL(usb_serial_suspend);
 int usb_serial_resume(struct usb_interface *intf)
 {
         struct usb_serial *serial = usb_get_intfdata(intf);
+        int rv;
 
         serial->suspending = 0;
         if (serial->type->resume)
-                return serial->type->resume(serial);
+                rv = serial->type->resume(serial);
+        else
+                rv = usb_serial_generic_resume(serial);
 
-        return 0;
+        return rv;
 }
 EXPORT_SYMBOL(usb_serial_resume);