linux-kernel - [PATCH 2/5][RFT] ACPI / hotplug: Introduce acpi_install_hotplug_notify

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Date:	Tue, 28 Jan 2014 23:13:26 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, Aaron Lu <aaron.lu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 2/5][RFT] ACPI / hotplug: Introduce acpi_install_hotplug_notify_handler()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Introduce a helper routine for installing acpi_hotplug_notify_cb()
as an ACPI notify handler for the given ACPI namespace node and make
acpi_scan_init_hotplug() use it.

This is to make subsequent changes easier to follow.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/scan.c     |   15 +++++++++++++--
 include/acpi/acpi_bus.h |    2 ++
 2 files changed, 15 insertions(+), 2 deletions(-)

Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -523,6 +523,18 @@ static void acpi_hotplug_notify_cb(acpi_
 	acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
 }
 
+void acpi_install_hotplug_notify_handler(acpi_handle handle, void *data)
+{
+	acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+				    acpi_hotplug_notify_cb, data);
+}
+
+void acpi_remove_hotplug_notify_handler(acpi_handle handle)
+{
+	acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+				   acpi_hotplug_notify_cb);
+}
+
 static ssize_t real_power_state_show(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
@@ -1961,8 +1973,7 @@ static void acpi_scan_init_hotplug(acpi_
 	list_for_each_entry(hwid, &pnp.ids, list) {
 		handler = acpi_scan_match_handler(hwid->id, NULL);
 		if (handler) {
-			acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
-					acpi_hotplug_notify_cb, handler);
+			acpi_install_hotplug_notify_handler(handle, handler);
 			break;
 		}
 	}
Index: linux-pm/include/acpi/acpi_bus.h
===================================================================
--- linux-pm.orig/include/acpi/acpi_bus.h
+++ linux-pm/include/acpi/acpi_bus.h
@@ -434,6 +434,8 @@ static inline bool acpi_device_enumerate
 typedef void (*acpi_hp_callback)(void *data, u32 src);
 
 acpi_status acpi_hotplug_execute(acpi_hp_callback func, void *data, u32 src);
+void acpi_install_hotplug_notify_handler(acpi_handle handle, void *data);
+void acpi_remove_hotplug_notify_handler(acpi_handle handle);
 
 /**
  * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver

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