Pull acpi_bus_register_driver into release branch

Conflicts:

	drivers/acpi/asus_acpi.c
	drivers/acpi/scan.c

4 files changed, 32 insertions, 32 deletions

diff --git a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c
index 1a545489e859..90eb3c5a15ca 100644
--- a/drivers/acpi/asus_acpi.c
+++ b/drivers/acpi/asus_acpi.c
@@ -1119,6 +1119,8 @@ static int asus_hotk_check(void)
         return result;
 }
 
+static int asus_hotk_found;
+
 static int asus_hotk_add(struct acpi_device *device)
 {
         acpi_status status = AE_OK;
@@ -1180,6 +1182,8 @@ static int asus_hotk_add(struct acpi_device *device)
                 }
         }
 
+        asus_hotk_found = 1;
+
       end:
         if (result) {
                 kfree(hotk);
@@ -1226,7 +1230,19 @@ static int __init asus_acpi_init(void)
         asus_proc_dir->owner = THIS_MODULE;
 
         result = acpi_bus_register_driver(&asus_hotk_driver);
-        if (result < 1) {
+        if (result < 0) {
+                remove_proc_entry(PROC_ASUS, acpi_root_dir);
+                return -ENODEV;
+        }
+
+        /*
+         * This is a bit of a kludge.  We only want this module loaded
+         * for ASUS systems, but there's currently no way to probe the
+         * ACPI namespace for ASUS HIDs.  So we just return failure if
+         * we didn't find one, which will cause the module to be
+         * unloaded.
+         */
+        if (!asus_hotk_found) {
                 acpi_bus_unregister_driver(&asus_hotk_driver);
                 remove_proc_entry(PROC_ASUS, acpi_root_dir);
                 return -ENODEV;
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index a5fa85832fa3..fc676ac0e3ed 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -142,7 +142,7 @@ static void acpi_device_register(struct acpi_device *device,
         create_sysfs_device_files(device);
 }
 
-static int acpi_device_unregister(struct acpi_device *device, int type)
+static void acpi_device_unregister(struct acpi_device *device, int type)
 {
         spin_lock(&acpi_device_lock);
         if (device->parent) {
@@ -158,7 +158,6 @@ static int acpi_device_unregister(struct acpi_device *device, int type)
         acpi_detach_data(device->handle, acpi_bus_data_handler);
         remove_sysfs_device_files(device);
         kobject_unregister(&device->kobj);
-        return 0;
 }
 
 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
@@ -537,10 +536,9 @@ static int acpi_start_single_object(struct acpi_device *device)
         return_VALUE(result);
 }
 
-static int acpi_driver_attach(struct acpi_driver *drv)
+static void acpi_driver_attach(struct acpi_driver *drv)
 {
         struct list_head *node, *next;
-        int count = 0;
 
         ACPI_FUNCTION_TRACE("acpi_driver_attach");
 
@@ -557,7 +555,6 @@ static int acpi_driver_attach(struct acpi_driver *drv)
                         if (!acpi_bus_driver_init(dev, drv)) {
                                 acpi_start_single_object(dev);
                                 atomic_inc(&drv->references);
-                                count++;
                                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                                   "Found driver [%s] for device [%s]\n",
                                                   drv->name, dev->pnp.bus_id));
@@ -566,10 +563,9 @@ static int acpi_driver_attach(struct acpi_driver *drv)
                 spin_lock(&acpi_device_lock);
         }
         spin_unlock(&acpi_device_lock);
-        return_VALUE(count);
 }
 
-static int acpi_driver_detach(struct acpi_driver *drv)
+static void acpi_driver_detach(struct acpi_driver *drv)
 {
         struct list_head *node, *next;
 
@@ -591,7 +587,6 @@ static int acpi_driver_detach(struct acpi_driver *drv)
                 }
         }
         spin_unlock(&acpi_device_lock);
-        return_VALUE(0);
 }
 
 /**
@@ -599,28 +594,22 @@ static int acpi_driver_detach(struct acpi_driver *drv)
  * @driver: driver being registered
  *
  * Registers a driver with the ACPI bus.  Searches the namespace for all
- * devices that match the driver's criteria and binds.  Returns the
- * number of devices that were claimed by the driver, or a negative
- * error status for failure.
+ * devices that match the driver's criteria and binds.  Returns zero for
+ * success or a negative error status for failure.
  */
 int acpi_bus_register_driver(struct acpi_driver *driver)
 {
-        int count;
-
         ACPI_FUNCTION_TRACE("acpi_bus_register_driver");
 
         if (acpi_disabled)
                 return_VALUE(-ENODEV);
 
-        if (!driver)
-                return_VALUE(-EINVAL);
-
         spin_lock(&acpi_device_lock);
         list_add_tail(&driver->node, &acpi_bus_drivers);
         spin_unlock(&acpi_device_lock);
-        count = acpi_driver_attach(driver);
+        acpi_driver_attach(driver);
 
-        return_VALUE(count);
+        return_VALUE(0);
 }
 
 EXPORT_SYMBOL(acpi_bus_register_driver);
@@ -632,13 +621,8 @@ EXPORT_SYMBOL(acpi_bus_register_driver);
  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
  * devices that match the driver's criteria and unbinds.
  */
-int acpi_bus_unregister_driver(struct acpi_driver *driver)
+void acpi_bus_unregister_driver(struct acpi_driver *driver)
 {
-        ACPI_FUNCTION_TRACE("acpi_bus_unregister_driver");
-
-        if (!driver)
-                return_VALUE(-EINVAL);
-
         acpi_driver_detach(driver);
 
         if (!atomic_read(&driver->references)) {
@@ -646,7 +630,7 @@ int acpi_bus_unregister_driver(struct acpi_driver *driver)
                 list_del_init(&driver->node);
                 spin_unlock(&acpi_device_lock);
         }
-        return_VALUE(0);
+        return;
 }
 
 EXPORT_SYMBOL(acpi_bus_unregister_driver);
diff --git a/drivers/char/sonypi.c b/drivers/char/sonypi.c
index a90f5d97df35..43dfd8689dce 100644
--- a/drivers/char/sonypi.c
+++ b/drivers/char/sonypi.c
@@ -512,7 +512,7 @@ static struct sonypi_device {
 
 #ifdef CONFIG_ACPI
 static struct acpi_device *sonypi_acpi_device;
-static int acpi_enabled;
+static int acpi_driver_registered;
 #endif
 
 static int sonypi_ec_write(u8 addr, u8 value)
@@ -869,7 +869,7 @@ found:
                 sonypi_report_input_event(event);
 
 #ifdef CONFIG_ACPI
-        if (acpi_enabled)
+        if (sonypi_acpi_device)
                 acpi_bus_generate_event(sonypi_acpi_device, 1, event);
 #endif
 
@@ -1551,8 +1551,8 @@ static int __init sonypi_init(void)
                 goto err_free_device;
 
 #ifdef CONFIG_ACPI
-        if (acpi_bus_register_driver(&sonypi_acpi_driver) > 0)
-                acpi_enabled = 1;
+        if (acpi_bus_register_driver(&sonypi_acpi_driver) >= 0)
+                acpi_driver_registered = 1;
 #endif
 
         return 0;
@@ -1567,7 +1567,7 @@ static int __init sonypi_init(void)
 static void __exit sonypi_exit(void)
 {
 #ifdef CONFIG_ACPI
-        if (acpi_enabled)
+        if (acpi_driver_registered)
                 acpi_bus_unregister_driver(&sonypi_acpi_driver);
 #endif
         platform_device_unregister(sonypi_platform_device);
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 43f8c2a23a24..8c7590fdd822 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -327,7 +327,7 @@ int acpi_bus_set_power(acpi_handle handle, int state);
 int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data);
 int acpi_bus_receive_event(struct acpi_bus_event *event);
 int acpi_bus_register_driver(struct acpi_driver *driver);
-int acpi_bus_unregister_driver(struct acpi_driver *driver);
+void acpi_bus_unregister_driver(struct acpi_driver *driver);
 int acpi_bus_add(struct acpi_device **child, struct acpi_device *parent,
                  acpi_handle handle, int type);
 int acpi_bus_trim(struct acpi_device *start, int rmdevice);