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powerpc/rtas: Fix watchdog driver temperature read functionality 

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>
Acked-by: Utz Bacher <utz.bacher@de.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Adrian Reber 2009-03-26 02:05:42 +00:00 committed by Benjamin Herrenschmidt
parent 6c16a74d42
commit 5ba762c9bb
1 changed files with 3 additions and 5 deletions
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8
drivers/watchdog/wdrtas.c
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@ -218,16 +218,14 @@ 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 */