[PATCH v1 1/1] mux: mux-core: Add NULL check for dev->of_node

[sathyanarayanan . kuppuswamy]

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>

If dev->of_node is NULL, then calling mux_control_get()
function can lead to NULL pointer exception. So adding
a NULL check for dev->of_node.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
 drivers/mux/mux-core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mux/mux-core.c b/drivers/mux/mux-core.c
index 90b8995..f226662 100644
--- a/drivers/mux/mux-core.c
+++ b/drivers/mux/mux-core.c
@@ -438,6 +438,9 @@ struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
 	int index = 0;
 	int ret;
 
+	if (!np)
+		return ERR_PTR(-ENODEV);
+
 	if (mux_name) {
 		index = of_property_match_string(np, "mux-control-names",
 						 mux_name);
@@ -448,6 +451,7 @@ struct mux_control *mux_control_get(struct device *dev, const char *mux_name)
 		}
 	}
 
+
 	ret = of_parse_phandle_with_args(np,
 					 "mux-controls", "#mux-control-cells",
 					 index, &args);
-- 
2.7.4