linux-kernel - [PATCH v5 07/16] ACPI / property: Don't limit named child node matching to data nodes

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Date:   Fri, 31 May 2019 17:15:38 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andy@...radead.org>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH v5 07/16] ACPI / property: Don't limit named child node matching to data nodes

There is no reason why we should limit the use of
fwnode_get_named_child_node() to data nodes only.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Tested-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/acpi/property.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 9d460a859be0..39c64291098f 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -603,15 +603,29 @@ static struct fwnode_handle *
 acpi_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
 				 const char *childname)
 {
+	char name[ACPI_PATH_SEGMENT_LENGTH];
 	struct fwnode_handle *child;
+	struct acpi_buffer path;
+	acpi_status status;
 
-	/*
-	 * Find first matching named child node of this fwnode.
-	 * For ACPI this will be a data only sub-node.
-	 */
-	fwnode_for_each_child_node(fwnode, child)
-		if (acpi_data_node_match(child, childname))
+	path.length = sizeof(name);
+	path.pointer = name;
+
+	fwnode_for_each_child_node(fwnode, child) {
+		if (is_acpi_data_node(child)) {
+			if (acpi_data_node_match(child, childname))
+				return child;
+			continue;
+		}
+
+		status = acpi_get_name(ACPI_HANDLE_FWNODE(child),
+				       ACPI_SINGLE_NAME, &path);
+		if (ACPI_FAILURE(status))
+			break;
+
+		if (!strncmp(name, childname, ACPI_NAMESEG_SIZE))
 			return child;
+	}
 
 	return NULL;
 }
-- 
2.20.1