[PATCH v2 3/3] powerpc/powernv: remove opal_sensor_mutex

[Cédric Le Goater]

The opal sensor mutex protects the opal_sensor_read call which
can return a OPAL_BUSY code on IBM Power systems if a previous 
request is in progress.

This can be handled at user level with a retry.

Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---
 arch/powerpc/platforms/powernv/opal-sensor.c |    5 -----
 1 file changed, 5 deletions(-)

Index: linux.git/arch/powerpc/platforms/powernv/opal-sensor.c
===================================================================
--- linux.git.orig/arch/powerpc/platforms/powernv/opal-sensor.c
+++ linux.git/arch/powerpc/platforms/powernv/opal-sensor.c
@@ -24,9 +24,6 @@
 #include <asm/opal.h>
 #include <asm/machdep.h>
 
-static DEFINE_MUTEX(opal_sensor_mutex);
-
-
 /*
  * opal_sensor_read() return codes
  *
@@ -76,7 +73,6 @@ int opal_get_sensor_data(u32 sensor_hndl
 		goto out;
 	}
 
-	mutex_lock(&opal_sensor_mutex);
 	ret = opal_sensor_read(sensor_hndl, token, &data);
 	switch (ret) {
 	case OPAL_ASYNC_COMPLETION:
@@ -102,7 +98,6 @@ int opal_get_sensor_data(u32 sensor_hndl
 	}
 
 out_token:
-	mutex_unlock(&opal_sensor_mutex);
 	opal_async_release_token(token);
 out:
 	return ret;