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authorMark Nelson <markn@au1.ibm.com>2009-03-23 20:30:41 +0000
committerPaul Mackerras <paulus@samba.org>2009-04-07 15:07:43 +1000
commitb6966b1be568e83a48585369731f1123a6f85157 (patch)
treecbed24a70a521a32965b18c589035e819003c7a4 /drivers/watchdog
parentae6e59caefd8d4097ccb096c95df95ec7e52fe88 (diff)
powerpc/wdrtas: Update wdrtas_get_interval to use rtas_data_buf
The buffer passed to the ibm,get-system-parameter RTAS call must be in the RMA. To ensure we pass an address in the RMA use rtas_data_buf for the actual RTAS call and then copy the result to value. We can't just make it static because this can be compiled in as a module. Also add the WDRTAS_SP_SPI_LEN so we don't litter '4' throughout the function. Signed-off-by: Mark Nelson <markn@au1.ibm.com> Tested-by: Adrian Reber <adrian@lisas.de> Acked-by: Utz Bacher <utz.bacher@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/wdrtas.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/watchdog/wdrtas.c b/drivers/watchdog/wdrtas.c
index 5d3b1a8e28b..a38fa4907c9 100644
--- a/drivers/watchdog/wdrtas.c
+++ b/drivers/watchdog/wdrtas.c
@@ -106,6 +106,8 @@ static int wdrtas_set_interval(int interval)
return result;
}
+#define WDRTAS_SP_SPI_LEN 4
+
/**
* wdrtas_get_interval - returns the current watchdog interval
* @fallback_value: value (in seconds) to use, if the RTAS call fails
@@ -119,10 +121,17 @@ static int wdrtas_set_interval(int interval)
static int wdrtas_get_interval(int fallback_value)
{
long result;
- char value[4];
+ char value[WDRTAS_SP_SPI_LEN];
+ spin_lock(&rtas_data_buf_lock);
+ memset(rtas_data_buf, 0, WDRTAS_SP_SPI_LEN);
result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL,
- WDRTAS_SP_SPI, (void *)__pa(&value), 4);
+ WDRTAS_SP_SPI, __pa(rtas_data_buf),
+ WDRTAS_SP_SPI_LEN);
+
+ memcpy(value, rtas_data_buf, WDRTAS_SP_SPI_LEN);
+ spin_unlock(&rtas_data_buf_lock);
+
if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) {
printk(KERN_WARNING "wdrtas: could not get sp_spi watchdog "
"timeout (%li). Continuing\n", result);