linux-kernel - [PATCH v6 9/9] acpi/thermal: Move handler installing logic to driver

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Date:   Fri, 30 Jun 2023 21:33:44 +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 v6 9/9] acpi/thermal: 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.

While at it, fix whitespaces in .remove() callback.

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
---
 drivers/acpi/thermal.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index f9f6ebb08fdb..97858ad59d68 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -825,8 +825,9 @@ static void acpi_queue_thermal_check(struct acpi_thermal *tz)
 		queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
 }
 
-static void acpi_thermal_notify(struct acpi_device *device, u32 event)
+static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
 {
+	struct acpi_device *device = data;
 	struct acpi_thermal *tz = acpi_driver_data(device);
 
 	if (!tz)
@@ -997,11 +998,21 @@ static int acpi_thermal_add(struct acpi_device *device)
 
 	pr_info("%s [%s] (%ld C)\n", acpi_device_name(device),
 		acpi_device_bid(device), deci_kelvin_to_celsius(tz->temperature));
-	goto end;
 
+	result = acpi_dev_install_notify_handler(device,
+						 ACPI_DEVICE_NOTIFY,
+						 acpi_thermal_notify);
+	if (result)
+		goto flush_wq;
+
+	return 0;
+
+flush_wq:
+	flush_workqueue(acpi_thermal_pm_queue);
+	acpi_thermal_unregister_thermal_zone(tz);
 free_memory:
 	kfree(tz);
-end:
+
 	return result;
 }
 
@@ -1012,10 +1023,15 @@ static void acpi_thermal_remove(struct acpi_device *device)
 	if (!device || !acpi_driver_data(device))
 		return;
 
-	flush_workqueue(acpi_thermal_pm_queue);
 	tz = acpi_driver_data(device);
 
+	acpi_dev_remove_notify_handler(device,
+				       ACPI_DEVICE_NOTIFY,
+				       acpi_thermal_notify);
+
+	flush_workqueue(acpi_thermal_pm_queue);
 	acpi_thermal_unregister_thermal_zone(tz);
+
 	kfree(tz);
 }
 
@@ -1078,7 +1094,6 @@ static struct acpi_driver acpi_thermal_driver = {
 	.ops = {
 		.add = acpi_thermal_add,
 		.remove = acpi_thermal_remove,
-		.notify = acpi_thermal_notify,
 		},
 	.drv.pm = &acpi_thermal_pm,
 };
-- 
2.41.0