PCI hotplug: fix return value of has_foo() functions

Current has_foo() functions in pci_hotplug_core.c returns 0 if the
"foo" property is true. It would cause misunderstanding. In addition,
the error code of those functions is never checked, so this patch
changes those functions' error code to 'bool' and return true if the
property "foo" is true.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Reviewed-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/hotplug/pci_hotplug_core.c

@@ -347,125 +347,126 @@ static struct pci_slot_attribute hotplug_slot_attr_test = {
 	.store = test_write_file
 };
 
-static int has_power_file(struct pci_slot *pci_slot)
+static bool has_power_file(struct pci_slot *pci_slot)
 {
 	struct hotplug_slot *slot = pci_slot->hotplug;
 	if ((!slot) || (!slot->ops))
-		return -ENODEV;
+		return false;
 	if ((slot->ops->enable_slot) ||
 	    (slot->ops->disable_slot) ||
 	    (slot->ops->get_power_status))
-		return 0;
-	return -ENOENT;
+		return true;
+	return false;
 }
 
-static int has_attention_file(struct pci_slot *pci_slot)
+static bool has_attention_file(struct pci_slot *pci_slot)
 {
 	struct hotplug_slot *slot = pci_slot->hotplug;
 	if ((!slot) || (!slot->ops))
-		return -ENODEV;
+		return false;
 	if ((slot->ops->set_attention_status) ||
 	    (slot->ops->get_attention_status))
-		return 0;
-	return -ENOENT;
+		return true;
+	return false;
 }
 
-static int has_latch_file(struct pci_slot *pci_slot)
+static bool has_latch_file(struct pci_slot *pci_slot)
 {
 	struct hotplug_slot *slot = pci_slot->hotplug;
 	if ((!slot) || (!slot->ops))
-		return -ENODEV;
+		return false;
 	if (slot->ops->get_latch_status)
-		return 0;
-	return -ENOENT;
+		return true;
+	return false;
 }
 
-static int has_adapter_file(struct pci_slot *pci_slot)
+static bool has_adapter_file(struct pci_slot *pci_slot)
 {
 	struct hotplug_slot *slot = pci_slot->hotplug;
 	if ((!slot) || (!slot->ops))
-		return -ENODEV;
+		return false;
 	if (slot->ops->get_adapter_status)
-		return 0;
-	return -ENOENT;
+		return true;
+	return false;
 }
 
-static int has_max_bus_speed_file(struct pci_slot *pci_slot)
+static bool has_max_bus_speed_file(struct pci_slot *pci_slot)
 {
 	struct hotplug_slot *slot = pci_slot->hotplug;
 	if ((!slot) || (!slot->ops))
-		return -ENODEV;
+		return false;
 	if (slot->ops->get_max_bus_speed)
-		return 0;
-	return -ENOENT;
+		return true;
+	return false;
 }
 
-static int has_cur_bus_speed_file(struct pci_slot *pci_slot)
+static bool has_cur_bus_speed_file(struct pci_slot *pci_slot)
 {
 	struct hotplug_slot *slot = pci_slot->hotplug;
 	if ((!slot) || (!slot->ops))
-		return -ENODEV;
+		return false;
 	if (slot->ops->get_cur_bus_speed)
-		return 0;
-	return -ENOENT;
+		return true;
+	return false;
 }
 
-static int has_test_file(struct pci_slot *pci_slot)
+static bool has_test_file(struct pci_slot *pci_slot)
 {
 	struct hotplug_slot *slot = pci_slot->hotplug;
 	if ((!slot) || (!slot->ops))
-		return -ENODEV;
+		return false;
 	if (slot->ops->hardware_test)
-		return 0;
-	return -ENOENT;
+		return true;
+	return false;
 }
 
 static int fs_add_slot(struct pci_slot *slot)
 {
 	int retval = 0;
 
-	if (has_power_file(slot) == 0) {
-		retval = sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr);
+	if (has_power_file(slot)) {
+		retval = sysfs_create_file(&slot->kobj,
+					   &hotplug_slot_attr_power.attr);
 		if (retval)
 			goto exit_power;
 	}
 
-	if (has_attention_file(slot) == 0) {
+	if (has_attention_file(slot)) {
 		retval = sysfs_create_file(&slot->kobj,
 					   &hotplug_slot_attr_attention.attr);
 		if (retval)
 			goto exit_attention;
 	}
 
-	if (has_latch_file(slot) == 0) {
+	if (has_latch_file(slot)) {
 		retval = sysfs_create_file(&slot->kobj,
 					   &hotplug_slot_attr_latch.attr);
 		if (retval)
 			goto exit_latch;
 	}
 
-	if (has_adapter_file(slot) == 0) {
+	if (has_adapter_file(slot)) {
 		retval = sysfs_create_file(&slot->kobj,
 					   &hotplug_slot_attr_presence.attr);
 		if (retval)
 			goto exit_adapter;
 	}
 
-	if (has_max_bus_speed_file(slot) == 0) {
+	if (has_max_bus_speed_file(slot)) {
 		retval = sysfs_create_file(&slot->kobj,
-					   &hotplug_slot_attr_max_bus_speed.attr);
+					&hotplug_slot_attr_max_bus_speed.attr);
 		if (retval)
 			goto exit_max_speed;
 	}
 
-	if (has_cur_bus_speed_file(slot) == 0) {
+	if (has_cur_bus_speed_file(slot)) {
 		retval = sysfs_create_file(&slot->kobj,
-					   &hotplug_slot_attr_cur_bus_speed.attr);
+					&hotplug_slot_attr_cur_bus_speed.attr);
 		if (retval)
 			goto exit_cur_speed;
 	}
 
-	if (has_test_file(slot) == 0) {
+	if (has_test_file(slot)) {
 		retval = sysfs_create_file(&slot->kobj,
 					   &hotplug_slot_attr_test.attr);
 		if (retval)
@@ -475,27 +476,26 @@ static int fs_add_slot(struct pci_slot *slot)
 	goto exit;
 
 exit_test:
-	if (has_cur_bus_speed_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
-
+	if (has_cur_bus_speed_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_cur_bus_speed.attr);
 exit_cur_speed:
-	if (has_max_bus_speed_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
-
+	if (has_max_bus_speed_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_max_bus_speed.attr);
 exit_max_speed:
-	if (has_adapter_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
-
+	if (has_adapter_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_presence.attr);
 exit_adapter:
-	if (has_latch_file(slot) == 0)
+	if (has_latch_file(slot))
 		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
-
 exit_latch:
-	if (has_attention_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
-
+	if (has_attention_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_attention.attr);
 exit_attention:
-	if (has_power_file(slot) == 0)
+	if (has_power_file(slot))
 		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 exit_power:
 exit:
@@ -504,25 +504,29 @@ exit:
 
 static void fs_remove_slot(struct pci_slot *slot)
 {
-	if (has_power_file(slot) == 0)
+	if (has_power_file(slot))
 		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
 
-	if (has_attention_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
+	if (has_attention_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_attention.attr);
 
-	if (has_latch_file(slot) == 0)
+	if (has_latch_file(slot))
 		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
 
-	if (has_adapter_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
+	if (has_adapter_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_presence.attr);
 
-	if (has_max_bus_speed_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
+	if (has_max_bus_speed_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_max_bus_speed.attr);
 
-	if (has_cur_bus_speed_file(slot) == 0)
-		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
+	if (has_cur_bus_speed_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_cur_bus_speed.attr);
 
-	if (has_test_file(slot) == 0)
+	if (has_test_file(slot))
 		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
 }