policy->cur is now set by cpufreq core when cpufreq_driver->get() is defined and so drivers aren't required to set it. When space_id is ACPI_ADR_SPACE_SYSTEM_IO for acpi cpufreq driver it doesn't set ->get to a valid function pointer and so policy->cur is required to be set by driver.
This is already followed in acpi-cpufreq driver. This patch adds a comment describing why we need to set policy->cur from driver. Suggested-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org> --- This change was requested by Rafael here: http://www.spinics.net/lists/linux-acpi/msg46748.html drivers/cpufreq/acpi-cpufreq.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index a8dac7b..8ecd74e 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -838,6 +838,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) switch (perf->control_register.space_id) { case ACPI_ADR_SPACE_SYSTEM_IO: /* Current speed is unknown and not detectable by IO port */ + /* ->cur wouldn't be set by core as ->get() is NULL */ policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); break; case ACPI_ADR_SPACE_FIXED_HARDWARE: -- 1.7.12.rc2.18.g61b472e -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
