[PATCH v6 4/9] acpi/video: Move handler installing logic to driver

From: Michal Wilczynski
Date: Fri Jun 30 2023 - 14:35:32 EST


Currently logic for installing notifications from ACPI devices is
implemented using notify callback in struct acpi_driver. Preparations
are being made to replace acpi_driver with more generic struct
platform_driver, which doesn't contain notify callback. Furthermore
as of now handlers are being called indirectly through
acpi_notify_device(), which decreases performance.

Call acpi_dev_install_notify_handler() at the end of .add() callback.
Call acpi_dev_remove_notify_handler() at the beginning of .remove()
callback. Change arguments passed to the notify function to match with
what's required by acpi_dev_install_notify_handler(). Remove .notify
callback initialization in acpi_driver.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Michal Wilczynski <michal.wilczynski@xxxxxxxxx>
---
drivers/acpi/acpi_video.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 62f4364e4460..168bb43e0c65 100644
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -77,7 +77,7 @@ static DEFINE_MUTEX(video_list_lock);
static LIST_HEAD(video_bus_head);
static int acpi_video_bus_add(struct acpi_device *device);
static void acpi_video_bus_remove(struct acpi_device *device);
-static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
+static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data);

/*
* Indices in the _BCL method response: the first two items are special,
@@ -104,7 +104,6 @@ static struct acpi_driver acpi_video_bus = {
.ops = {
.add = acpi_video_bus_add,
.remove = acpi_video_bus_remove,
- .notify = acpi_video_bus_notify,
},
};

@@ -1527,8 +1526,9 @@ static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
acpi_osi_is_win8() ? 0 : 1);
}

-static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
+static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data)
{
+ struct acpi_device *device = data;
struct acpi_video_bus *video = acpi_driver_data(device);
struct input_dev *input;
int keycode = 0;
@@ -2053,8 +2053,20 @@ static int acpi_video_bus_add(struct acpi_device *device)

acpi_video_bus_add_notify_handler(video);

+ error = acpi_dev_install_notify_handler(device,
+ ACPI_DEVICE_NOTIFY,
+ acpi_video_bus_notify);
+ if (error)
+ goto err_remove;
+
return 0;

+err_remove:
+ mutex_lock(&video_list_lock);
+ list_del(&video->entry);
+ mutex_unlock(&video_list_lock);
+ acpi_video_bus_remove_notify_handler(video);
+ acpi_video_bus_unregister_backlight(video);
err_put_video:
acpi_video_bus_put_devices(video);
kfree(video->attached_array);
@@ -2075,6 +2087,10 @@ static void acpi_video_bus_remove(struct acpi_device *device)

video = acpi_driver_data(device);

+ acpi_dev_remove_notify_handler(device,
+ ACPI_DEVICE_NOTIFY,
+ acpi_video_bus_notify);
+
mutex_lock(&video_list_lock);
list_del(&video->entry);
mutex_unlock(&video_list_lock);
--
2.41.0