[Skiboot] [PATCH] occ-sensor: clean dt properties if sensor is not available

[Balamuruhan S]

In `occ_sensor_init()` device tree node is created for sensor-goups
and performs `occ_sensor_sanity()` check to initialize the device
tree. But if there are no sensors like in Qemu, sanity check fails
but still device tree populates the sensor-groups node wrongly as
the node created is not cleaned up.

Signed-off-by: Balamuruhan S <bala24 at linux.ibm.com>
---
 hw/occ-sensor.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/hw/occ-sensor.c b/hw/occ-sensor.c
index d06ca725..ec116c9a 100644
--- a/hw/occ-sensor.c
+++ b/hw/occ-sensor.c
@@ -491,6 +491,7 @@ bool occ_sensors_init(void)
 	struct dt_node *sg, *exports;
 	int occ_num = 0, i;
 	bool has_gpu = false;
+	bool has_sensor = false;
 
 	/* OCC inband sensors is only supported in P9 */
 	if (proc_gen != proc_gen_p9)
@@ -526,7 +527,9 @@ bool occ_sensors_init(void)
 		md = get_names_block(hb);
 
 		/* Sanity check of the Sensor Data Header Block */
-		if (!occ_sensor_sanity(hb, chip->id))
+		if (occ_sensor_sanity(hb, chip->id))
+			has_sensor = true;
+		else
 			continue;
 
 		phandles = malloc(hb->nr_sensors * sizeof(u32));
@@ -587,6 +590,10 @@ bool occ_sensors_init(void)
 		free(phandles);
 		free(ptype);
 	}
+	if (!has_sensor) {
+		/* clear the device tree property for sensors */
+               dt_free(sg);
+	}
 
 	if (!occ_num)
 		return false;
-- 
2.14.5