[PATCH v2] Fix RTAS watchdog driver temperature read functionality

[Adrian Reber <adrian@lisas.de>]

Using the RTAS watchdog driver to read out the temperature crashes
on a PXCAB:

Unable to handle kernel paging request for data at address 0xfe347b50
Faulting instruction address: 0xc00000000001af64
Oops: Kernel access of bad area, sig: 11 [#1]

The wrong usage of "(void *)__pa(&temperature)" in rtas_call() is
removed by using the function rtas_get_sensor() which does the
right thing.

Signed-off-by: Adrian Reber <adrian@lisas.de>
---
v2: use rtas_get_sensor(); typo fixed
---
 drivers/watchdog/wdrtas.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/watchdog/wdrtas.c b/drivers/watchdog/wdrtas.c
index 5d3b1a8..a9f00dc 100644
--- a/drivers/watchdog/wdrtas.c
+++ b/drivers/watchdog/wdrtas.c
@@ -214,16 +214,14 @@ static void wdrtas_timer_keepalive(void)
  */
 static int wdrtas_get_temperature(void)
 {
-	long result;
+	int result;
 	int temperature = 0;
 
-	result = rtas_call(wdrtas_token_get_sensor_state, 2, 2,
-			   (void *)__pa(&temperature),
-			   WDRTAS_THERMAL_SENSOR, 0);
+	result = rtas_get_sensor(WDRTAS_THERMAL_SENSOR, 0, &temperature);
 
 	if (result < 0)
 		printk(KERN_WARNING "wdrtas: reading the thermal sensor "
-		       "faild: %li\n", result);
+		       "failed: %i\n", result);
 	else
 		temperature = ((temperature * 9) / 5) + 32; /* fahrenheit */
 
-- 
1.5.6.6