[PATCH v3] powernv/sensor: Handle OPAL_WRONG_STATE error return

[Vipin K Parashar <vipin@linux.vnet.ibm.com>]

OPAL returns OPAL_WRONG_STATE upon failing to provide
sensor data due to core sleeping/offline. Added check
for OPAL_WRONG_STATE rerurn code with sensor read failure.
Also added a log message indicating sensor data being
queried for sleeping/offline core.

Signed-off-by: Vipin K Parashar <vipin@linux.vnet.ibm.com>
---
Changes in v3:
 - Added a new case for OPAL_WRONG_STATE in sensor read
   along with a log message indicating sleeping/offline core
   causing read fail.

 arch/powerpc/platforms/powernv/opal-sensor.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/opal-sensor.c b/arch/powerpc/platforms/powernv/opal-sensor.c
index 308efd1..fb6d6bb 100644
--- a/arch/powerpc/platforms/powernv/opal-sensor.c
+++ b/arch/powerpc/platforms/powernv/opal-sensor.c
@@ -64,6 +64,12 @@ int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data)
 		*sensor_data = be32_to_cpu(data);
 		break;
 
+	case OPAL_WRONG_STATE:
+		pr_notice("%s: Sensor data read failure due to "
+				"core sleeping/offline\n", __func__);
+		ret = -EIO;
+		break;
+
 	default:
 		ret = opal_error_code(ret);
 		break;
-- 
2.7.4