[PATCH v6 7/9] acpi/nfit: Move handler installing logic to driver

[Michal Wilczynski <michal.wilczynski@intel.com>]

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
acpi_nfit_shutdown(). 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.

Introduce a new devm action acpi_nfit_remove_notify_handler.

Move acpi_nfit_notify() upwards in the file, so it can be used inside
acpi_nfit_add() and acpi_nfit_remove_notify_handler().

Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
---
 drivers/acpi/nfit/core.c | 41 +++++++++++++++++++++++++++++++---------
 1 file changed, 32 insertions(+), 9 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 07204d482968..ee2365a80aa1 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -3282,6 +3282,24 @@ static void acpi_nfit_put_table(void *table)
 	acpi_put_table(table);
 }
 
+static void acpi_nfit_notify(acpi_handle handle, u32 event, void *data)
+{
+	struct acpi_device *adev = data;
+
+	device_lock(&adev->dev);
+	__acpi_nfit_notify(&adev->dev, handle, event);
+	device_unlock(&adev->dev);
+}
+
+void acpi_nfit_remove_notify_handler(void *data)
+{
+	struct acpi_device *adev = data;
+
+	acpi_dev_remove_notify_handler(adev,
+				       ACPI_DEVICE_NOTIFY,
+				       acpi_nfit_notify);
+}
+
 void acpi_nfit_shutdown(void *data)
 {
 	struct acpi_nfit_desc *acpi_desc = data;
@@ -3368,7 +3386,20 @@ 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;
+
+	rc = acpi_dev_install_notify_handler(adev,
+					     ACPI_DEVICE_NOTIFY,
+					     acpi_nfit_notify);
+	if (rc)
+		return rc;
+
+	return devm_add_action_or_reset(dev,
+					acpi_nfit_remove_notify_handler,
+					adev);
 }
 
 static void acpi_nfit_remove(struct acpi_device *adev)
@@ -3446,13 +3477,6 @@ void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
 }
 EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
 
-static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
-{
-	device_lock(&adev->dev);
-	__acpi_nfit_notify(&adev->dev, adev->handle, event);
-	device_unlock(&adev->dev);
-}
-
 static const struct acpi_device_id acpi_nfit_ids[] = {
 	{ "ACPI0012", 0 },
 	{ "", 0 },
@@ -3465,7 +3489,6 @@ static struct acpi_driver acpi_nfit_driver = {
 	.ops = {
 		.add = acpi_nfit_add,
 		.remove = acpi_nfit_remove,
-		.notify = acpi_nfit_notify,
 	},
 };
 
-- 
2.41.0