usb_gadget: composite cdc gadget fault handling

These two fixes ensure the new "CDC Composite Device" gadget
fails cleanly when it's loaded on hardware that can't support
this particular gadget driver.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 88d4f5452c49..abf9505d3a75 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -1090,6 +1090,9 @@ void gserial_cleanup(void)
         unsigned        i;
         struct gs_port  *port;
 
+        if (!gs_tty_driver)
+                return;
+
         /* start sysfs and /dev/ttyGS* node removal */
         for (i = 0; i < n_ports; i++)
                 tty_unregister_device(gs_tty_driver, i);