usb_wwan: fix error case in close()

The device never needs to be resumed in close(). But the counters
must be balanced. As resumption can fail, but the counters must
be balanced, use the _no_resume() version which cannot fail.

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

diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index fe5e48eb9693bf70b0dde39c702dde6017bc5c65..817e6ff8de8bc8aebd549697bd3b090315753281 100644 (file)
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -424,6 +424,7 @@ int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
        spin_lock_irq(&intfdata->susp_lock);
        portdata->opened = 1;
        spin_unlock_irq(&intfdata->susp_lock);
+       /* this balances a get in the generic USB serial code */
        usb_autopm_put_interface(serial->interface);
 
        return 0;
@@ -450,7 +451,8 @@ void usb_wwan_close(struct usb_serial_port *port)
                        usb_kill_urb(portdata->in_urbs[i]);
                for (i = 0; i < N_OUT_URB; i++)
                        usb_kill_urb(portdata->out_urbs[i]);
-               usb_autopm_get_interface(serial->interface);
+               /* balancing - important as an error cannot be handled*/
+               usb_autopm_get_interface_no_resume(serial->interface);
                serial->interface->needs_remote_wakeup = 0;
        }
 }