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[IA64] Fix processor_get_freq 

The core cpufreq code doesn't appear to understand returning -EAGAIN
for the get() function of the cpufreq_driver.  If PAL_GET_PSTATE returns
-1, such as when running on Xen, scaling_cur_freq is happy to return
4294967285 kHz (ie. (unsigned)-11).  The other drivers appear to return
0 for a failure, and doing so gives me the max frequency from
scaling_cur_frequency and "<unknown>" from cpuinfo_cur_frequency.  I
believe that's the desired behavior.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Alex Williamson 2007-08-13 15:49:46 -06:00 committed by Tony Luck
parent 352b0ef50d
commit 182fdd225d
1 changed files with 2 additions and 4 deletions
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6
arch/ia64/kernel/cpufreq/acpi-cpufreq.c
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@ -113,10 +113,8 @@ processor_get_freq (
saved_mask = current->cpus_allowed;
set_cpus_allowed(current, cpumask_of_cpu(cpu));
if (smp_processor_id() != cpu) {
ret = -EAGAIN;
if (smp_processor_id() != cpu)
goto migrate_end;
}
/* processor_get_pstate gets the instantaneous frequency */
ret = processor_get_pstate(&value);
@ -125,7 +123,7 @@ processor_get_freq (
set_cpus_allowed(current, saved_mask);
printk(KERN_WARNING "get performance failed with error %d\n",
ret);
ret = -EAGAIN;
ret = 0;
goto migrate_end;
}
clock_freq = extract_clock(data, value, cpu);