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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: 90b066b15e "ACPI / video: Add a acpi_video_handles_brightness_key_presses() helper"
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2016-01-14 09:41:46 +01:00 committed by Rafael J. Wysocki
parent 970530cd00
commit 14e9355363
1 changed files with 2 additions and 5 deletions
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7
drivers/acpi/acpi_video.c
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@ -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);