From: Hans de Goede Date: Thu, 14 Jan 2016 08:41:46 +0000 (+0100) Subject: ACPI / video: Fix using an uninitialized mutex / list_head in acpi_video_handles_brig... X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=14e9355363fc5bf98ba63875e117f29d1902d253;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git ACPI / video: Fix using an uninitialized mutex / list_head in acpi_video_handles_brightness_key_presses() If acpi_video_handles_brightness_key_presses() was called before acpi_video_register(), it would use the video_list mutex / list_head uninitialized. This patch fixes this by using DEFINE_MUTEX / LIST_HEAD when declaring these, instead of initializing them runtime from acpi_video_register(). Fixes: 90b066b15eda "ACPI / video: Add a acpi_video_handles_brightness_key_presses() helper" Signed-off-by: Hans de Goede Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index d95aaa51f733..408b014f8b64 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -92,8 +92,8 @@ module_param(only_lcd, bool, 0444); static int register_count; static DEFINE_MUTEX(register_count_mutex); -static struct mutex video_list_lock; -static struct list_head video_bus_head; +static DEFINE_MUTEX(video_list_lock); +static LIST_HEAD(video_bus_head); static int acpi_video_bus_add(struct acpi_device *device); static int acpi_video_bus_remove(struct acpi_device *device); static void acpi_video_bus_notify(struct acpi_device *device, u32 event); @@ -2067,9 +2067,6 @@ int acpi_video_register(void) goto leave; } - mutex_init(&video_list_lock); - INIT_LIST_HEAD(&video_bus_head); - dmi_check_system(video_dmi_table); ret = acpi_bus_register_driver(&acpi_video_bus);