linux-kernel - [PATCH v7 4/9] acpi/video: Move handler installing logic to driver

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Date:   Mon,  3 Jul 2023 11:02:47 +0300
From:   Michal Wilczynski <michal.wilczynski@...el.com>
To:     linux-acpi@...r.kernel.org
Cc:     rafael@...nel.org, dan.j.williams@...el.com,
        vishal.l.verma@...el.com, lenb@...nel.org, dave.jiang@...el.com,
        ira.weiny@...el.com, rui.zhang@...el.com,
        linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev,
        Michal Wilczynski <michal.wilczynski@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH v7 4/9] acpi/video: Move handler installing logic to driver

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@...el.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
---
 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