Merge tag 'mac80211-for-davem-2018-05-09' of git://git.kernel.org/pub/scm/linux/kerne...

[sfrench/cifs-2.6.git] / drivers / usb / host / xhci-dbgtty.c

diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c
index 48779c44c361d98db9f25ce3609860d243beea9f..eb494ec547e806e9d5656f072160d58bf68a0d17 100644 (file)
--- a/drivers/usb/host/xhci-dbgtty.c
+++ b/drivers/usb/host/xhci-dbgtty.c
@@ -320,9 +320,11 @@ int xhci_dbc_tty_register_driver(struct xhci_hcd *xhci)
 
 void xhci_dbc_tty_unregister_driver(void)
 {
-       tty_unregister_driver(dbc_tty_driver);
-       put_tty_driver(dbc_tty_driver);
-       dbc_tty_driver = NULL;
+       if (dbc_tty_driver) {
+               tty_unregister_driver(dbc_tty_driver);
+               put_tty_driver(dbc_tty_driver);
+               dbc_tty_driver = NULL;
+       }
 }
 
 static void dbc_rx_push(unsigned long _port)