[RFC 4/5] ACPI: align acpi_fwnode_get_reference_args with OF counterpart

[Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

acpi_fwnode_get_reference_args currently returns -EINVAL if a property
isn't found. -EINVAL is returned on parse error as well, and a
non-existent property is, for a list of references with arguments, usually
effectively the same as a property without entries.

Thus use -ENODATA to signal this as well. -EINVAL is still used to tell
about parse errors.

Signed-off-by: Sakari Ailus <sakari.ailus-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
 drivers/acpi/property.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index c1c216163de3..c6c777341023 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1211,6 +1211,9 @@ acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
 	unsigned int i;
 	int ret;
 
+	if (acpi_node_prop_get(fwnode, prop, NULL))
+		return -ENODATA;
+
 	ret = __acpi_node_get_property_reference(fwnode, prop, index,
 						 args_count, &acpi_args);
 	if (ret < 0)
-- 
2.11.0

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