gpio: mockup: fix NULL pointer dereference when removing debugfs

We now remove the device's debugfs entries when unbinding the driver.
This now causes a NULL-pointer dereference on module exit because the
platform devices are unregistered *after* the global debugfs directory
has been recursively removed. Fix it by unregistering the devices first.

Fixes: 303e6da99429 ("gpio: mockup: remove gpio debugfs when remove device")
Cc: Wei Yongjun <weiyongjun1@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index a2e505a..ab89cd8 100644 (file)
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -597,9 +597,9 @@ static int __init gpio_mockup_init(void)
 
 static void __exit gpio_mockup_exit(void)
 {
+       gpio_mockup_unregister_pdevs();
        debugfs_remove_recursive(gpio_mockup_dbg_dir);
        platform_driver_unregister(&gpio_mockup_driver);
-       gpio_mockup_unregister_pdevs();
 }
 
 module_init(gpio_mockup_init);