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path: root/drivers/acpi/acpi_video.c
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Diffstat (limited to 'drivers/acpi/acpi_video.c')
-rw-r--r--drivers/acpi/acpi_video.c52
1 files changed, 33 insertions, 19 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 06a006ff89b0..a76f8be1bfe7 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -90,10 +90,10 @@ 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 struct mutex video_list_lock;
-static struct list_head video_bus_head;
+static int register_count;
+static DEFINE_MUTEX(register_count_mutex);
+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);
@@ -479,6 +479,15 @@ static struct dmi_system_id video_dmi_table[] = {
* as brightness control does not work.
*/
{
+ /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
+ .callback = video_disable_backlight_sysfs_if,
+ .ident = "Toshiba Portege R700",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
+ },
+ },
+ {
/* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
.callback = video_disable_backlight_sysfs_if,
.ident = "Toshiba Portege R830",
@@ -487,6 +496,15 @@ static struct dmi_system_id video_dmi_table[] = {
DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
},
},
+ {
+ /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
+ .callback = video_disable_backlight_sysfs_if,
+ .ident = "Toshiba Satellite R830",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
+ },
+ },
/*
* Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
* but the IDs actually follow the Device ID Scheme.
@@ -2049,8 +2067,8 @@ 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.
@@ -2058,9 +2076,6 @@ 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);
@@ -2071,22 +2086,22 @@ 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);
@@ -2094,21 +2109,20 @@ 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);