linux-kernel - [PATCH 1/2] slimbus: ngd: Fix build error on x86

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Date:   Mon, 12 Nov 2018 12:25:25 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     niklas.cassel@...aro.org, linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 1/2] slimbus: ngd: Fix build error on x86

on non DT platforms like x86 of_match_node is set to NULL, dereferencing
directly would throw an error.
Fix this by doing this in two steps, get the match then the data.

Reported-by: Greg KH <gregkh@...uxfoundation.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/slimbus/qcom-ngd-ctrl.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index 7218fb963d0a..7de8907723a2 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1330,11 +1330,12 @@ static int of_qcom_slim_ngd_register(struct device *parent,
 {
 	const struct ngd_reg_offset_data *data;
 	struct qcom_slim_ngd *ngd;
+	const struct of_device_id *match;
 	struct device_node *node;
 	u32 id;
 
-	data = of_match_node(qcom_slim_ngd_dt_match, parent->of_node)->data;
-
+	match = of_match_node(qcom_slim_ngd_dt_match, parent->of_node);
+	data = match->data;
 	for_each_available_child_of_node(parent->of_node, node) {
 		if (of_property_read_u32(node, "reg", &id))
 			continue;
-- 
2.19.1