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Code Issues Releases Wiki Activity

cpufreq: acpi-cpufreq: Fix up the handling of cpb sysfs attribute

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The cpb sysfs attribute is only exposed by the ACPI cpufreq driver
after a runtime check.  For this purpose, the driver keeps a NULL
placeholder in its table of sysfs attributes and replaces the NULL
with a pointer to an attribute structure if it decides to expose
cpb.

That is confusing, so make the driver set the pointer to the cpb
attribute structure upfront and replace it with NULL if the
attribute should not be exposed instead.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2015-07-22 22:12:10 +02:00
parent 3427616b2a
commit f56c50e322
1 changed files with 11 additions and 10 deletions
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21
drivers/cpufreq/acpi-cpufreq.c
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@ -888,7 +888,9 @@ static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
static struct freq_attr *acpi_cpufreq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
&freqdomain_cpus,
NULL, /* this is a placeholder for cpb, do not remove */
#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
&cpb,
#endif
NULL,
};
@ -961,17 +963,16 @@ static int __init acpi_cpufreq_init(void)
* only if configured. This is considered legacy code, which
* will probably be removed at some point in the future.
*/
if (check_amd_hwpstate_cpu(0)) {
struct freq_attr **iter;
if (!check_amd_hwpstate_cpu(0)) {
struct freq_attr **attr;
pr_debug("adding sysfs entry for cpb\n");
pr_debug("CPB unsupported, do not expose it\n");
for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
;
/* make sure there is a terminator behind it */
if (iter[1] == NULL)
*iter = &cpb;
for (attr = acpi_cpufreq_attr; *attr; attr++)
if (*attr == &cpb) {
*attr = NULL;
break;
}
}
#endif
acpi_cpufreq_boost_init();