linux-kernel - [PATCH v5 09/10] acpi/nfit: Move handler installing logic to driver

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Date:   Fri, 16 Jun 2023 19:50:33 +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 v5 09/10] acpi/nfit: 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_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/nfit/core.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 95930e9d776c..a281bdfee8a0 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -3312,11 +3312,13 @@ void acpi_nfit_shutdown(void *data)
 }
 EXPORT_SYMBOL_GPL(acpi_nfit_shutdown);
 
-static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
+static void acpi_nfit_notify(acpi_handle handle, u32 event, void *data)
 {
-	device_lock(&adev->dev);
-	__acpi_nfit_notify(&adev->dev, adev->handle, event);
-	device_unlock(&adev->dev);
+	struct acpi_device *device = data;
+
+	device_lock(&device->dev);
+	__acpi_nfit_notify(&device->dev, handle, event);
+	device_unlock(&device->dev);
 }
 
 static int acpi_nfit_add(struct acpi_device *adev)
@@ -3375,12 +3377,23 @@ static int acpi_nfit_add(struct acpi_device *adev)
 
 	if (rc)
 		return rc;
-	return devm_add_action_or_reset(dev, acpi_nfit_shutdown, acpi_desc);
+
+	rc = devm_add_action_or_reset(dev, acpi_nfit_shutdown, acpi_desc);
+	if (rc)
+		return rc;
+
+	return acpi_dev_install_notify_handler(adev,
+					       ACPI_DEVICE_NOTIFY,
+					       acpi_nfit_notify);
 }
 
 static void acpi_nfit_remove(struct acpi_device *adev)
 {
 	/* see acpi_nfit_unregister */
+
+	acpi_dev_remove_notify_handler(adev,
+				       ACPI_DEVICE_NOTIFY,
+				       acpi_nfit_notify);
 }
 
 static void acpi_nfit_update_notify(struct device *dev, acpi_handle handle)
@@ -3465,7 +3478,6 @@ static struct acpi_driver acpi_nfit_driver = {
 	.ops = {
 		.add = acpi_nfit_add,
 		.remove = acpi_nfit_remove,
-		.notify = acpi_nfit_notify,
 	},
 };
 
-- 
2.41.0