From: Jon Povey <jon.povey@racelogic.co.uk>
Date: Mon, 14 Jun 2010 10:42:10 +0000 (+0900)
Subject: USB: g_serial: fix tty cleanup on unload
X-Git-Tag: firefly_0821_release~10186^2~1362
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=41be4cf9fb0106bc531145c1dce21405c8591949;p=firefly-linux-kernel-4.4.55.git

USB: g_serial: fix tty cleanup on unload

commit b23097b793081358a6d943263c91bae4c955c4e3 upstream.

Call put_tty_driver() in cleanup function, to fix Oops when trying to open
gadget serial char device after module unload.

Signed-off-by: Jon Povey <jon.povey@racelogic.co.uk>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index f10311768f90..9e5f9f1e47a2 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -1183,6 +1183,7 @@ void gserial_cleanup(void)
 	n_ports = 0;
 
 	tty_unregister_driver(gs_tty_driver);
+	put_tty_driver(gs_tty_driver);
 	gs_tty_driver = NULL;
 
 	pr_debug("%s: cleaned up ttyGS* support\n", __func__);