USB: serial: fix up reset_resume callback

If the usb-serial driver doesn't have a reset_resume callback, then we
need to tell the USB core that it doesn't, and it needs to rebind the
device.

Thanks to Alan for pointing out my mistake, and providing the fix.

Reported-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 846506f05e12..6a1b609a0d94 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1176,8 +1176,10 @@ static int usb_serial_reset_resume(struct usb_interface *intf)
         serial->suspending = 0;
         if (serial->type->reset_resume)
                 rv = serial->type->reset_resume(serial);
-        else
-                rv = usb_serial_generic_resume(serial);
+        else {
+                rv = -EOPNOTSUPP;
+                intf->needs_binding = 1;
+        }
 
         return rv;
 }