ACPI: Make unload/reload of modules work properly w.r.t. /proc

drivers/acpi/ac.c

@@ -159,12 +159,6 @@ acpi_ac_add_fs (
 
 	ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
 
-	if (!acpi_ac_dir) {
-		acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
-		if (!acpi_ac_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	if (!acpi_device_dir(device)) {
 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 			acpi_ac_dir);
@@ -194,9 +188,6 @@ acpi_ac_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
 
-	if (!acpi_ac_dir)
-		return_VALUE(-ENODEV);
-
 	if (acpi_device_dir(device))
 		remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 
@@ -330,6 +321,10 @@ acpi_ac_init (void)
 
 	ACPI_FUNCTION_TRACE("acpi_ac_init");
 
+	acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
+	if (!acpi_ac_dir)
+		return_VALUE(-ENODEV);
+
 	result = acpi_bus_register_driver(&acpi_ac_driver);
 	if (result < 0) {
 		remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
@@ -343,12 +338,10 @@ acpi_ac_init (void)
 void __exit
 acpi_ac_exit (void)
 {
-	int			result = 0;
-
 	ACPI_FUNCTION_TRACE("acpi_ac_exit");
 
-	result = acpi_bus_unregister_driver(&acpi_ac_driver);
-	if (!result)
+	acpi_bus_unregister_driver(&acpi_ac_driver);
+
 	remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
 
 	return_VOID;

drivers/acpi/battery.c

@@ -615,12 +615,6 @@ acpi_battery_add_fs (
 
 	ACPI_FUNCTION_TRACE("acpi_battery_add_fs");
 
-	if (!acpi_battery_dir) {
-		acpi_battery_dir = proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
-		if (!acpi_battery_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	if (!acpi_device_dir(device)) {
 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 			acpi_battery_dir);
@@ -675,9 +669,6 @@ acpi_battery_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_battery_remove_fs");
 
-	if (!acpi_battery_dir)
-		return_VALUE(-ENODEV);
-
 	if (acpi_device_dir(device))
 		remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 
@@ -812,6 +803,10 @@ acpi_battery_init (void)
 
 	ACPI_FUNCTION_TRACE("acpi_battery_init");
 
+	acpi_battery_dir = proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
+	if (!acpi_battery_dir)
+		return_VALUE(-ENODEV);
+
 	result = acpi_bus_register_driver(&acpi_battery_driver);
 	if (result < 0) {
 		remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
@@ -825,12 +820,10 @@ acpi_battery_init (void)
 static void __exit
 acpi_battery_exit (void)
 {
-	int			result = 0;
-
 	ACPI_FUNCTION_TRACE("acpi_battery_exit");
 
-	result = acpi_bus_unregister_driver(&acpi_battery_driver);
-	if (!result)
+	acpi_bus_unregister_driver(&acpi_battery_driver);
+
 	remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
 
 	return_VOID;

drivers/acpi/button.c

@@ -141,12 +141,6 @@ acpi_button_add_fs (
 
 	button = acpi_driver_data(device);
 
-	if (!acpi_button_dir) {
-		acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
-		if (!acpi_button_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	switch (button->type) {
 	case ACPI_BUTTON_TYPE_POWER:
 	case ACPI_BUTTON_TYPE_POWERF:
@@ -190,9 +184,6 @@ acpi_button_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_button_remove_fs");
 
-	if (!acpi_button_dir)
-		return_VALUE(-ENODEV);
-
 	if (acpi_device_dir(device))
 		remove_proc_entry(acpi_device_bid(device), acpi_button_dir);
 
@@ -446,9 +437,15 @@ acpi_button_init (void)
 
 	ACPI_FUNCTION_TRACE("acpi_button_init");
 
+	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
+	if (!acpi_button_dir)
+		return_VALUE(-ENODEV);
+
 	result = acpi_bus_register_driver(&acpi_button_driver);
-	if (result < 0)
+	if (result < 0) {
+		remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 		return_VALUE(-ENODEV);
+	}
 
 	return_VALUE(0);
 }
@@ -461,6 +458,8 @@ acpi_button_exit (void)
 
 	acpi_bus_unregister_driver(&acpi_button_driver);
 
+	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+
 	return_VOID;
 }
 

drivers/acpi/ec.c

@@ -477,12 +477,6 @@ acpi_ec_add_fs (
 
 	ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
 
-	if (!acpi_ec_dir) {
-		acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
-		if (!acpi_ec_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	if (!acpi_device_dir(device)) {
 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 			acpi_ec_dir);
@@ -508,12 +502,6 @@ acpi_ec_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
 
-	if (!acpi_ec_dir)
-		return_VALUE(-ENODEV);
-
-	if (acpi_device_dir(device))
-		remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
-
 	return_VALUE(0);
 }
 
@@ -789,8 +777,17 @@ static int __init acpi_ec_init (void)
 	if (acpi_disabled)
 		return_VALUE(0);
 
+	acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
+	if (!acpi_ec_dir)
+		return_VALUE(-ENODEV);
+
 	/* Now register the driver for the EC */
 	result = acpi_bus_register_driver(&acpi_ec_driver);
+	if (result < 0) {
+		remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
+		return_VALUE(-ENODEV);
+	}
+
 	return_VALUE(result);
 }
 
@@ -813,14 +810,11 @@ acpi_ec_ecdt_exit (void)
 static void __exit
 acpi_ec_exit (void)
 {
-	int			result = 0;
-
 	ACPI_FUNCTION_TRACE("acpi_ec_exit");
 
-	result = acpi_bus_unregister_driver(&acpi_ec_driver);
-	if (!result)
-		remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
+	acpi_bus_unregister_driver(&acpi_ec_driver);
 
+	remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
 
 	acpi_ec_ecdt_exit();
 

drivers/acpi/fan.c

@@ -151,12 +151,6 @@ acpi_fan_add_fs (
 	if (!device)
 		return_VALUE(-EINVAL);
 
-	if (!acpi_fan_dir) {
-		acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
-		if (!acpi_fan_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	if (!acpi_device_dir(device)) {
 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 			acpi_fan_dir);
@@ -187,9 +181,6 @@ acpi_fan_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_fan_remove_fs");
 
-	if (!acpi_fan_dir)
-		return_VALUE(-ENODEV);
-
 	if (acpi_device_dir(device))
 		remove_proc_entry(acpi_device_bid(device), acpi_fan_dir);
 
@@ -276,9 +267,15 @@ acpi_fan_init (void)
 
 	ACPI_FUNCTION_TRACE("acpi_fan_init");
 
+	acpi_fan_dir = proc_mkdir(ACPI_FAN_CLASS, acpi_root_dir);
+	if (!acpi_fan_dir)
+		return_VALUE(-ENODEV);
+
 	result = acpi_bus_register_driver(&acpi_fan_driver);
-	if (result < 0)
+	if (result < 0) {
+		remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 		return_VALUE(-ENODEV);
+	}
 
 	return_VALUE(0);
 }
@@ -287,12 +284,10 @@ acpi_fan_init (void)
 void __exit
 acpi_fan_exit (void)
 {
-	int			result = 0;
-
 	ACPI_FUNCTION_TRACE("acpi_fan_exit");
 
-	result = acpi_bus_unregister_driver(&acpi_fan_driver);
-	if (!result)
+	acpi_bus_unregister_driver(&acpi_fan_driver);
+
 	remove_proc_entry(ACPI_FAN_CLASS, acpi_root_dir);
 
 	return_VOID;

drivers/acpi/power.c

@@ -443,12 +443,6 @@ acpi_power_add_fs (
 	if (!device)
 		return_VALUE(-EINVAL);
 
-	if (!acpi_power_dir) {
-		acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
-		if (!acpi_power_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	if (!acpi_device_dir(device)) {
 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 			acpi_power_dir);
@@ -478,9 +472,6 @@ acpi_power_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_power_remove_fs");
 
-	if (!acpi_power_dir)
-		return_VALUE(-ENODEV);
-
 	if (acpi_device_dir(device))
 		remove_proc_entry(acpi_device_bid(device), acpi_power_dir);
 
@@ -591,6 +582,10 @@ static int __init acpi_power_init (void)
 
 	INIT_LIST_HEAD(&acpi_power_resource_list);
 
+	acpi_power_dir = proc_mkdir(ACPI_POWER_CLASS, acpi_root_dir);
+	if (!acpi_power_dir)
+		return_VALUE(-ENODEV);
+
 	result = acpi_bus_register_driver(&acpi_power_driver);
 	if (result < 0) {
 		remove_proc_entry(ACPI_POWER_CLASS, acpi_root_dir);

drivers/acpi/processor.c

@@ -2289,13 +2289,6 @@ acpi_processor_add_fs (
 
 	ACPI_FUNCTION_TRACE("acpi_processor_add_fs");
 
-	if (!acpi_processor_dir) {
-		acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, 
-			acpi_root_dir);
-		if (!acpi_processor_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	if (!acpi_device_dir(device)) {
 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 			acpi_processor_dir);
@@ -2378,9 +2371,6 @@ acpi_processor_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_processor_remove_fs");
 
-	if (!acpi_processor_dir)
-		return_VALUE(-ENODEV);
-
 	if (acpi_device_dir(device))
 		remove_proc_entry(acpi_device_bid(device), acpi_processor_dir);
 
@@ -2640,9 +2630,15 @@ acpi_processor_init (void)
 	memset(&processors, 0, sizeof(processors));
 	memset(&errata, 0, sizeof(errata));
 
+	acpi_processor_dir = proc_mkdir(ACPI_PROCESSOR_CLASS, acpi_root_dir);
+	if (!acpi_processor_dir)
+		return_VALUE(-ENODEV);
+
 	result = acpi_bus_register_driver(&acpi_processor_driver);
-	if (result < 0)
+	if (result < 0) {
+		remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 		return_VALUE(-ENODEV);
+	}
 
 	return_VALUE(0);
 }
@@ -2651,12 +2647,10 @@ acpi_processor_init (void)
 static void __exit
 acpi_processor_exit (void)
 {
-	int			result = 0;
-
 	ACPI_FUNCTION_TRACE("acpi_processor_exit");
 
-	result = acpi_bus_unregister_driver(&acpi_processor_driver);
-	if (!result)
+	acpi_bus_unregister_driver(&acpi_processor_driver);
+
 	remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
 
 	return_VOID;

drivers/acpi/thermal.c

@@ -1060,13 +1060,6 @@ acpi_thermal_add_fs (
 
 	ACPI_FUNCTION_TRACE("acpi_thermal_add_fs");
 
-	if (!acpi_thermal_dir) {
-		acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, 
-			acpi_root_dir);
-		if (!acpi_thermal_dir)
-			return_VALUE(-ENODEV);
-	}
-
 	if (!acpi_device_dir(device)) {
 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 			acpi_thermal_dir);
@@ -1147,9 +1140,6 @@ acpi_thermal_remove_fs (
 {
 	ACPI_FUNCTION_TRACE("acpi_thermal_remove_fs");
 
-	if (!acpi_thermal_dir)
-		return_VALUE(-ENODEV);
-
 	if (acpi_device_dir(device))
 		remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
 
@@ -1351,9 +1341,15 @@ acpi_thermal_init (void)
 
 	ACPI_FUNCTION_TRACE("acpi_thermal_init");
 
+	acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
+	if (!acpi_thermal_dir)
+		return_VALUE(-ENODEV);
+
 	result = acpi_bus_register_driver(&acpi_thermal_driver);
-	if (result < 0)
+	if (result < 0) {
+		remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
 		return_VALUE(-ENODEV);
+	}
 
 	return_VALUE(0);
 }
@@ -1362,12 +1358,10 @@ acpi_thermal_init (void)
 static void __exit
 acpi_thermal_exit (void)
 {
-	int			result = 0;
-
 	ACPI_FUNCTION_TRACE("acpi_thermal_exit");
 
-	result = acpi_bus_unregister_driver(&acpi_thermal_driver);
-	if (!result)
+	acpi_bus_unregister_driver(&acpi_thermal_driver);
+
 	remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
 
 	return_VOID;