netdev - [PATCH v2 04/16] ACPI: property: Return present device nodes only on fwnode interface

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Message-ID: <20250924074602.266292-5-sakari.ailus@linux.intel.com>
Date: Wed, 24 Sep 2025 10:45:50 +0300
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: linux-acpi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	linux-input@...r.kernel.org,
	linux-leds@...r.kernel.org,
	linux-media@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-spi@...r.kernel.org,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Daniel Scally <djrscally@...il.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Javier Carrasco <javier.carrasco@...fvision.net>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Lee Jones <lee@...nel.org>,
	Pavel Machek <pavel@...nel.org>,
	Matthias Fend <matthias.fend@...end.at>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Paul Elder <paul.elder@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Mark Brown <broonie@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v2 04/16] ACPI: property: Return present device nodes only on fwnode interface

fwnode_graph_get_next_subnode() may return fwnode backed by ACPI device
nodes and there has been no check these devices are present in the system,
unlike there has been on fwnode OF backend. In order to provide consistent
behaviour towards callers, add a check for device presence by introducing
a new function acpi_get_next_present_subnode(), used as the
get_next_child_node() fwnode operation that also checks device node
presence.

Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
---
 drivers/acpi/property.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 5438592dc136..01f3880ffcce 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1319,6 +1319,26 @@ acpi_get_next_subnode(const struct fwnode_handle *fwnode,
 	return NULL;
 }
 
+/**
+ * acpi_get_next_present_subnode - Return the next present 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.
+ * Like acpi_get_next_subnode(), but the device nodes returned by
+ * acpi_get_next_present_subnode() are guaranteed to be present.
+ * Returns: The next sub-node fwnode handle.
+ */
+static struct fwnode_handle *
+acpi_get_next_present_subnode(const struct fwnode_handle *fwnode,
+			      struct fwnode_handle *child)
+{
+	do {
+		child = acpi_get_next_subnode(fwnode, child);
+	} while (is_acpi_device_node(child) &&
+		 !acpi_device_is_present(to_acpi_device_node(child)));
+
+	return child;
+}
+
 /**
  * acpi_node_get_parent - Return parent fwnode of this fwnode
  * @fwnode: Firmware node whose parent to get
@@ -1664,7 +1684,7 @@ static int acpi_fwnode_irq_get(const struct fwnode_handle *fwnode,
 		.property_read_string_array =				\
 			acpi_fwnode_property_read_string_array,		\
 		.get_parent = acpi_node_get_parent,			\
-		.get_next_child_node = acpi_get_next_subnode,		\
+		.get_next_child_node = acpi_get_next_present_subnode,	\
 		.get_named_child_node = acpi_fwnode_get_named_child_node, \
 		.get_name = acpi_fwnode_get_name,			\
 		.get_name_prefix = acpi_fwnode_get_name_prefix,		\
-- 
2.47.3