linux-kernel - [PATCH v3 08/14] ACPI: ARM64: IORT: rework iort_node_get

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Date:   Tue, 25 Oct 2016 23:09:23 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Marc Zyngier <marc.zyngier@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     <linux-acpi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Tomasz Nowicki <tn@...ihalf.com>, Ma Jun <majun258@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        "Agustin Vega-Frias" <agustinv@...eaurora.org>,
        Sinan Kaya <okaya@...eaurora.org>,
        "G Gregory" <graeme.gregory@...aro.org>,
        Charles Garcia-Tobin <charles.garcia-tobin@....com>,
        <huxinwei@...wei.com>, <yimin@...wei.com>, <linuxarm@...wei.com>,
        Hanjun Guo <hanjun.guo@...aro.org>
Subject: [PATCH v3 08/14] ACPI: ARM64: IORT: rework iort_node_get_id()

From: Hanjun Guo <hanjun.guo@...aro.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.guo@...aro.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Marc Zyngier <marc.zyngier@....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