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powerpc/wdrtas: Update wdrtas_get_interval to use rtas_data_buf

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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>
This commit is contained in:
Mark Nelson 2009-03-23 20:30:41 +00:00 committed by Paul Mackerras
parent ae6e59caef
commit b6966b1be5
1 changed files with 11 additions and 2 deletions
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13
drivers/watchdog/wdrtas.c
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@ -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);