[PATCH] cs5535_gpio.c: call cdev_del() during module_exit to unmap kobject references...

During module unloading, cdev_del() must be called to unmap cdev related
kobject references and other cleanups(such as inode->i_cdev being set to
NULL) which prevents the OOPS upon subsequent loading, usage and unloading
of modules(as seen in the mail thread
http://marc.theaimsgroup.com/?l=linux-kernel&m=114533640609018&w=2).

Also, remove unneeded test of gpio_base.

Signed-off-by: Thayumanavar Sachithanantham <thayumk@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/cs5535_gpio.c b/drivers/char/cs5535_gpio.c
index 5d72f50de1ac97c6e377fb6c5e0d0d4192016983..46d66037b917c5851222b56af77f4b158ce793aa 100644 (file)
--- a/drivers/char/cs5535_gpio.c
+++ b/drivers/char/cs5535_gpio.c
@@ -241,9 +241,10 @@ static int __init cs5535_gpio_init(void)
 static void __exit cs5535_gpio_cleanup(void)
 {
        dev_t dev_id = MKDEV(major, 0);
+
+       cdev_del(&cs5535_gpio_cdev);
        unregister_chrdev_region(dev_id, CS5535_GPIO_COUNT);
-       if (gpio_base != 0)
-               release_region(gpio_base, CS5535_GPIO_SIZE);
+       release_region(gpio_base, CS5535_GPIO_SIZE);
 }
 
 module_init(cs5535_gpio_init);