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ACPI: Avoid wiping out pr->performance during preregistering

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When cpufreq driver call acpi_processor_preregister_performance() , function
will clean up pr->performance even if there is possibly already registered
other cpufreq driver. The patch fix this potential problem. It also remove
double checks in P domain basic validity code and move these checks to function
where _PSD data is captured.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Stanislaw Gruszka 2009-03-24 13:41:59 +01:00 committed by Len Brown
parent 8e0ee43bc2
commit e1eb47797a
1 changed files with 21 additions and 25 deletions
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46
drivers/acpi/processor_perflib.c
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@ -479,6 +479,13 @@ static int acpi_processor_get_psd(struct acpi_processor *pr)
goto end;
}
if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
result = -EFAULT;
goto end;
}
end:
kfree(buffer.pointer);
return result;
@ -501,9 +508,10 @@ int acpi_processor_preregister_performance(
mutex_lock(&performance_mutex);
retval = 0;
/* Call _PSD for all CPUs */
/*
* Check if another driver has already registered, and abort before
* changing pr->performance if it has. Check input data as well.
*/
for_each_possible_cpu(i) {
pr = per_cpu(processors, i);
if (!pr) {
@ -513,13 +521,20 @@ int acpi_processor_preregister_performance(
if (pr->performance) {
retval = -EBUSY;
continue;
goto err_out;
}
if (!performance || !percpu_ptr(performance, i)) {
retval = -EINVAL;
continue;
goto err_out;
}
}
/* Call _PSD for all CPUs */
for_each_possible_cpu(i) {
pr = per_cpu(processors, i);
if (!pr)
continue;
pr->performance = percpu_ptr(performance, i);
cpumask_set_cpu(i, pr->performance->shared_cpu_map);
@ -535,26 +550,6 @@ int acpi_processor_preregister_performance(
* Now that we have _PSD data from all CPUs, lets setup P-state
* domain info.
*/
for_each_possible_cpu(i) {
pr = per_cpu(processors, i);
if (!pr)
continue;
/* Basic validity check for domain info */
pdomain = &(pr->performance->domain_info);
if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
(pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
retval = -EINVAL;
goto err_ret;
}
if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
retval = -EINVAL;
goto err_ret;
}
}
cpumask_clear(covered_cpus);
for_each_possible_cpu(i) {
pr = per_cpu(processors, i);
@ -643,6 +638,7 @@ err_ret:
pr->performance = NULL; /* Will be set for real in register */
}
err_out:
mutex_unlock(&performance_mutex);
free_cpumask_var(covered_cpus);
return retval;