Merge branches 'acpica', 'acpi-property', 'acpi-pm' and 'acpi-battery'

Merge an ACPICA change, device ACPI properties handling update, ACPI
power management updates, and an ACPI battery driver update for
6.19-rc1:

 - Avoid walking the ACPI namespace in the AML interpreter if the
   starting node cannot be determined (Cryolitia PukNgae)

 - Use min() instead of min_t() in the ACPI device properties handling
   code to avoid discarding significant bits (David Laight)

 - Fix potential fwnode refcount leak in acpi_fwnode_graph_parse_endpoint()
   that may prevent the parent fwnode from being released (Haotian Zhang)

 - Rework acpi_graph_get_next_endpoint() to use ACPI functions only, remove
   unnecessary contitionals from it to make it easier to follow, and make
   acpi_get_next_subnode() static (Sakari Ailus)

 - Drop unused function acpi_get_lps0_constraint(), make some Low-Power
   S0 callback functions for suspend-to-idle static, and rearrange the
   code retrieving Low-Power S0 constraits so it only runs when the
   constraits are actually used (Rafael Wysocki)

 - Drop redundant locking from the ACPI battery driver (Rafael Wysocki)

* acpica:
  ACPICA: Avoid walking the Namespace if start_node is NULL

* acpi-property:
  ACPI: property: use min() instead of min_t()
  ACPI: property: Fix fwnode refcount leak in acpi_fwnode_graph_parse_endpoint()
  ACPI: property: Rework acpi_graph_get_next_endpoint()
  ACPI: property: Use ACPI functions in acpi_graph_get_next_endpoint() only
  ACPI: property: Make acpi_get_next_subnode() static

* acpi-pm:
  ACPI: PM: s2idle: Only retrieve constraints when needed
  ACPI: PM: s2idle: Staticise LPS0 callback functions
  ACPI: PM: s2idle: Drop acpi_get_lps0_constraint()

* acpi-battery:
  ACPI: battery: Drop redundant locking

Author: rafaeljw

drivers/acpi/acpica/nswalk.c

@@ -169,9 +169,12 @@ acpi_ns_walk_namespace(acpi_object_type type,
 
 	if (start_node == ACPI_ROOT_OBJECT) {
 		start_node = acpi_gbl_root_node;
-		if (!start_node) {
-			return_ACPI_STATUS(AE_NO_NAMESPACE);
-		}
+	}
+
+	/* Avoid walking the namespace if the StartNode is NULL */
+
+	if (!start_node) {
+		return_ACPI_STATUS(AE_NO_NAMESPACE);
 	}
 
 	/* Null child means "get first node" */

drivers/acpi/battery.c

@@ -91,7 +91,6 @@ enum {
 };
 
 struct acpi_battery {
-	struct mutex lock;
 	struct mutex update_lock;
 	struct power_supply *bat;
 	struct power_supply_desc bat_desc;
@@ -535,11 +534,9 @@ static int acpi_battery_get_info(struct acpi_battery *battery)
 		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 		acpi_status status = AE_ERROR;
 
-		mutex_lock(&battery->lock);
 		status = acpi_evaluate_object(battery->device->handle,
 					      use_bix ? "_BIX":"_BIF",
 					      NULL, &buffer);
-		mutex_unlock(&battery->lock);
 
 		if (ACPI_FAILURE(status)) {
 			acpi_handle_info(battery->device->handle,
@@ -576,11 +573,8 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
 			msecs_to_jiffies(cache_time)))
 		return 0;
 
-	mutex_lock(&battery->lock);
 	status = acpi_evaluate_object(battery->device->handle, "_BST",
 				      NULL, &buffer);
-	mutex_unlock(&battery->lock);
-
 	if (ACPI_FAILURE(status)) {
 		acpi_handle_info(battery->device->handle,
 				 "_BST evaluation failed: %s",
@@ -628,11 +622,8 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery)
 	    !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 		return -ENODEV;
 
-	mutex_lock(&battery->lock);
 	status = acpi_execute_simple_method(battery->device->handle, "_BTP",
 					    battery->alarm);
-	mutex_unlock(&battery->lock);
-
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
 
@@ -1235,9 +1226,6 @@ static int acpi_battery_add(struct acpi_device *device)
 	strscpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 	strscpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 	device->driver_data = battery;
-	result = devm_mutex_init(&device->dev, &battery->lock);
-	if (result)
-		return result;
 
 	result = devm_mutex_init(&device->dev, &battery->update_lock);
 	if (result)

drivers/acpi/property.c

@@ -1280,7 +1280,7 @@ static int acpi_data_prop_read(const struct acpi_device_data *data,
 		ret = acpi_copy_property_array_uint(items, (u64 *)val, nval);
 		break;
 	case DEV_PROP_STRING:
-		nval = min_t(u32, nval, obj->package.count);
+		nval = min(nval, obj->package.count);
 		if (nval == 0)
 			return -ENODATA;
 
@@ -1329,13 +1329,14 @@ static int stop_on_next(struct acpi_device *adev, void *data)
 	return 0;
 }
 
-/**
+/*
  * acpi_get_next_subnode - Return the next child node handle for a fwnode
  * @fwnode: Firmware node to find the next child node for.
  * @child: Handle to one of the device's child nodes or a null handle.
  */
-struct fwnode_handle *acpi_get_next_subnode(const struct fwnode_handle *fwnode,
-					    struct fwnode_handle *child)
+static struct fwnode_handle *
+acpi_get_next_subnode(const struct fwnode_handle *fwnode,
+		      struct fwnode_handle *child)
 {
 	struct acpi_device *adev = to_acpi_device_node(fwnode);
 
@@ -1472,7 +1473,7 @@ static struct fwnode_handle *acpi_graph_get_next_endpoint(
 
 	if (!prev) {
 		do {
-			port = fwnode_get_next_child_node(fwnode, port);
+			port = acpi_get_next_subnode(fwnode, port);
 			/*
 			 * The names of the port nodes begin with "port@"
 			 * followed by the number of the port node and they also
@@ -1490,14 +1491,17 @@ static struct fwnode_handle *acpi_graph_get_next_endpoint(
 	if (!port)
 		return NULL;
 
-	endpoint = fwnode_get_next_child_node(port, prev);
-	while (!endpoint) {
-		port = fwnode_get_next_child_node(fwnode, port);
-		if (!port)
+	do {
+		endpoint = acpi_get_next_subnode(port, prev);
+		if (endpoint)
 			break;
-		if (is_acpi_graph_node(port, "port"))
-			endpoint = fwnode_get_next_child_node(port, NULL);
-	}
+
+		prev = NULL;
+
+		do {
+			port = acpi_get_next_subnode(fwnode, port);
+		} while (port && !is_acpi_graph_node(port, "port"));
+	} while (port);
 
 	/*
 	 * The names of the endpoint nodes begin with "endpoint@" followed by
@@ -1714,6 +1718,7 @@ static int acpi_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 	if (fwnode_property_read_u32(fwnode, "reg", &endpoint->id))
 		fwnode_property_read_u32(fwnode, "endpoint", &endpoint->id);
 
+	fwnode_handle_put(port_fwnode);
 	return 0;
 }
 

drivers/acpi/sleep.h

@@ -17,10 +17,7 @@ static inline acpi_status acpi_set_waking_vector(u32 wakeup_address)
 
 extern int acpi_s2idle_begin(void);
 extern int acpi_s2idle_prepare(void);
-extern int acpi_s2idle_prepare_late(void);
-extern void acpi_s2idle_check(void);
 extern bool acpi_s2idle_wake(void);
-extern void acpi_s2idle_restore_early(void);
 extern void acpi_s2idle_restore(void);
 extern void acpi_s2idle_end(void);
 

drivers/acpi/x86/s2idle.c

@@ -299,34 +299,13 @@ static void lpi_device_get_constraints(void)
 	ACPI_FREE(out_obj);
 }
 
-/**
- * acpi_get_lps0_constraint - Get the LPS0 constraint for a device.
- * @adev: Device to get the constraint for.
- *
- * The LPS0 constraint is the shallowest (minimum) power state in which the
- * device can be so as to allow the platform as a whole to achieve additional
- * energy conservation by utilizing a system-wide low-power state.
- *
- * Returns:
- *  - ACPI power state value of the constraint for @adev on success.
- *  - Otherwise, ACPI_STATE_UNKNOWN.
- */
-int acpi_get_lps0_constraint(struct acpi_device *adev)
-{
-	struct lpi_constraints *entry;
-
-	for_each_lpi_constraint(entry) {
-		if (adev->handle == entry->handle)
-			return entry->min_dstate;
-	}
-
-	return ACPI_STATE_UNKNOWN;
-}
-
 static void lpi_check_constraints(void)
 {
 	struct lpi_constraints *entry;
 
+	if (IS_ERR_OR_NULL(lpi_constraints_table))
+		return;
+
 	for_each_lpi_constraint(entry) {
 		struct acpi_device *adev = acpi_fetch_acpi_dev(entry->handle);
 
@@ -508,11 +487,6 @@ static int lps0_device_attach(struct acpi_device *adev,
 
 	lps0_device_handle = adev->handle;
 
-	if (acpi_s2idle_vendor_amd())
-		lpi_device_get_constraints_amd();
-	else
-		lpi_device_get_constraints();
-
 	/*
 	 * Use suspend-to-idle by default if ACPI_FADT_LOW_POWER_S0 is set in
 	 * the FADT and the default suspend mode was not set from the command
@@ -539,7 +513,26 @@ static struct acpi_scan_handler lps0_handler = {
 	.attach = lps0_device_attach,
 };
 
-int acpi_s2idle_prepare_late(void)
+static int acpi_s2idle_begin_lps0(void)
+{
+	if (pm_debug_messages_on && !lpi_constraints_table) {
+		if (acpi_s2idle_vendor_amd())
+			lpi_device_get_constraints_amd();
+		else
+			lpi_device_get_constraints();
+
+		/*
+		 * Try to retrieve the constraints only once because failures
+		 * to do so usually are sticky.
+		 */
+		if (!lpi_constraints_table)
+			lpi_constraints_table = ERR_PTR(-ENODATA);
+	}
+
+	return acpi_s2idle_begin();
+}
+
+static int acpi_s2idle_prepare_late_lps0(void)
 {
 	struct acpi_s2idle_dev_ops *handler;
 
@@ -585,7 +578,7 @@ int acpi_s2idle_prepare_late(void)
 	return 0;
 }
 
-void acpi_s2idle_check(void)
+static void acpi_s2idle_check_lps0(void)
 {
 	struct acpi_s2idle_dev_ops *handler;
 
@@ -598,7 +591,7 @@ void acpi_s2idle_check(void)
 	}
 }
 
-void acpi_s2idle_restore_early(void)
+static void acpi_s2idle_restore_early_lps0(void)
 {
 	struct acpi_s2idle_dev_ops *handler;
 
@@ -636,12 +629,12 @@ void acpi_s2idle_restore_early(void)
 }
 
 static const struct platform_s2idle_ops acpi_s2idle_ops_lps0 = {
-	.begin = acpi_s2idle_begin,
+	.begin = acpi_s2idle_begin_lps0,
 	.prepare = acpi_s2idle_prepare,
-	.prepare_late = acpi_s2idle_prepare_late,
-	.check = acpi_s2idle_check,
+	.prepare_late = acpi_s2idle_prepare_late_lps0,
+	.check = acpi_s2idle_check_lps0,
 	.wake = acpi_s2idle_wake,
-	.restore_early = acpi_s2idle_restore_early,
+	.restore_early = acpi_s2idle_restore_early_lps0,
 	.restore = acpi_s2idle_restore,
 	.end = acpi_s2idle_end,
 };

include/linux/acpi.h

@@ -1146,12 +1146,7 @@ struct acpi_s2idle_dev_ops {
 #if defined(CONFIG_SUSPEND) && defined(CONFIG_X86)
 int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg);
 void acpi_unregister_lps0_dev(struct acpi_s2idle_dev_ops *arg);
-int acpi_get_lps0_constraint(struct acpi_device *adev);
 #else /* CONFIG_SUSPEND && CONFIG_X86 */
-static inline int acpi_get_lps0_constraint(struct device *dev)
-{
-	return ACPI_STATE_UNKNOWN;
-}
 static inline int acpi_register_lps0_dev(struct acpi_s2idle_dev_ops *arg)
 {
 	return -ENODEV;
@@ -1349,9 +1344,6 @@ acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
 int acpi_node_prop_get(const struct fwnode_handle *fwnode, const char *propname,
 		       void **valptr);
 
-struct fwnode_handle *acpi_get_next_subnode(const struct fwnode_handle *fwnode,
-					    struct fwnode_handle *child);
-
 struct acpi_probe_entry;
 typedef bool (*acpi_probe_entry_validate_subtbl)(struct acpi_subtable_header *,
 						 struct acpi_probe_entry *);
@@ -1450,13 +1442,6 @@ static inline int acpi_node_prop_get(const struct fwnode_handle *fwnode,
 	return -ENXIO;
 }
 
-static inline struct fwnode_handle *
-acpi_get_next_subnode(const struct fwnode_handle *fwnode,
-		      struct fwnode_handle *child)
-{
-	return NULL;
-}
-
 static inline struct fwnode_handle *
 acpi_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
 			     struct fwnode_handle *prev)