[PATCH v3 08/14] ACPI: ARM64: IORT: rework iort_node_get_id()

[Hanjun Guo]

From: Hanjun Guo <hanjun....@linaro.org>

iort_node_get_id() has two output, one is the mapped ids,
the other is the referenced parent node which is returned
from the function.

For now we need a API just return its parent node for
single mapping, so just update this function slightly then
reuse it later.

Signed-off-by: Hanjun Guo <hanjun....@linaro.org>
Cc: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
Cc: Marc Zyngier <marc.zyng...@arm.com>
---
 drivers/acpi/arm64/iort.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 7d543aa..2881108 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -347,7 +347,8 @@ struct acpi_iort_node *iort_node_get_id(struct 
acpi_iort_node *node,
        if (map[index].flags & ACPI_IORT_ID_SINGLE_MAPPING) {
                if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
                    node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
-                       *id_out = map[index].output_base;
+                       if (id_out)
+                               *id_out = map[index].output_base;
                        return parent;
                }
        }
-- 
1.7.12.4