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-rw-r--r--drivers/acpi/acpi_video.c27
1 files changed, 13 insertions, 14 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 15863a81d869..d95aaa51f733 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -90,8 +90,8 @@ module_param(device_id_scheme, bool, 0444);
static bool only_lcd = false;
module_param(only_lcd, bool, 0444);
-static DECLARE_COMPLETION(register_done);
-static DEFINE_MUTEX(register_done_mutex);
+static int register_count;
+static DEFINE_MUTEX(register_count_mutex);
static struct mutex video_list_lock;
static struct list_head video_bus_head;
static int acpi_video_bus_add(struct acpi_device *device);
@@ -2058,8 +2058,8 @@ int acpi_video_register(void)
{
int ret = 0;
- mutex_lock(&register_done_mutex);
- if (completion_done(&register_done)) {
+ mutex_lock(&register_count_mutex);
+ if (register_count) {
/*
* if the function of acpi_video_register is already called,
* don't register the acpi_vide_bus again and return no error.
@@ -2080,22 +2080,22 @@ int acpi_video_register(void)
* When the acpi_video_bus is loaded successfully, increase
* the counter reference.
*/
- complete(&register_done);
+ register_count = 1;
leave:
- mutex_unlock(&register_done_mutex);
+ mutex_unlock(&register_count_mutex);
return ret;
}
EXPORT_SYMBOL(acpi_video_register);
void acpi_video_unregister(void)
{
- mutex_lock(&register_done_mutex);
- if (completion_done(&register_done)) {
+ mutex_lock(&register_count_mutex);
+ if (register_count) {
acpi_bus_unregister_driver(&acpi_video_bus);
- reinit_completion(&register_done);
+ register_count = 0;
}
- mutex_unlock(&register_done_mutex);
+ mutex_unlock(&register_count_mutex);
}
EXPORT_SYMBOL(acpi_video_unregister);
@@ -2103,21 +2103,20 @@ void acpi_video_unregister_backlight(void)
{
struct acpi_video_bus *video;
- mutex_lock(&register_done_mutex);
- if (completion_done(&register_done)) {
+ mutex_lock(&register_count_mutex);
+ if (register_count) {
mutex_lock(&video_list_lock);
list_for_each_entry(video, &video_bus_head, entry)
acpi_video_bus_unregister_backlight(video);
mutex_unlock(&video_list_lock);
}
- mutex_unlock(&register_done_mutex);
+ mutex_unlock(&register_count_mutex);
}
bool acpi_video_handles_brightness_key_presses(void)
{
bool have_video_busses;
- wait_for_completion(&register_done);
mutex_lock(&video_list_lock);
have_video_busses = !list_empty(&video_bus_head);
mutex_unlock(&video_list_lock);