From bc6cf3669d22371f573ab0305b3abf13887c0786 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Wed, 13 Jun 2018 17:08:59 +0200
Subject: [PATCH] serdev: fix memleak on module unload
Git-commit: bc6cf3669d22371f573ab0305b3abf13887c0786
Patch-mainline: v4.18-rc3
References: bsc#1051510

Make sure to free all resources associated with the ida on module
exit.

Fixes: cd6484e1830b ("serdev: Introduce new bus for serial attached devices")
Cc: stable <stable@vger.kernel.org>	# 4.11
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/tty/serdev/core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/tty/serdev/core.c
+++ b/drivers/tty/serdev/core.c
@@ -480,6 +480,7 @@ EXPORT_SYMBOL_GPL(__serdev_device_driver
 static void __exit serdev_exit(void)
 {
 	bus_unregister(&serdev_bus_type);
+	ida_destroy(&ctrl_ida);
 }
 module_exit(serdev_exit);