Commit 34411a69 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / processor: Do not request ACPI cpufreq module directly 



Function acpi_processor_load_module() used by the ACPI processor
driver can only really work if the acpi-cpufreq module is available
when acpi_processor_start() is executed which usually is not the case
for systems loading the processor driver module from an initramfs.

Moreover, that used to be a hackish workaround for module autoloading
issues, but udev loads acpi-cpufreq just fine nowadays, so that
function isn't really necessary any more.  For this reason, drop
acpi_processor_load_module() entirely.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 764d0221

drivers/acpi/processor_driver.c

+0 −1
Original line number Diff line number Diff line
@@ -171,7 +171,6 @@ static int __acpi_processor_start(struct acpi_device *device) 


#ifdef CONFIG_CPU_FREQ

	acpi_processor_ppc_has_changed(pr, 0);

	acpi_processor_load_module(pr);

#endif

	acpi_processor_get_throttling_info(pr);

drivers/acpi/processor_perflib.c

+0 −22
Original line number Diff line number Diff line
@@ -235,28 +235,6 @@ void acpi_processor_ppc_exit(void) 
	acpi_processor_ppc_status &= ~PPC_REGISTERED;

}



/*

 * Do a quick check if the systems looks like it should use ACPI

 * cpufreq. We look at a _PCT method being available, but don't

 * do a whole lot of sanity checks.

 */

void acpi_processor_load_module(struct acpi_processor *pr)

{

	static int requested;

	acpi_status status = 0;

	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };



	if (!arch_has_acpi_pdc() || requested)

		return;

	status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);

	if (!ACPI_FAILURE(status)) {

		printk(KERN_INFO PREFIX "Requesting acpi_cpufreq\n");

		request_module_nowait("acpi_cpufreq");

		requested = 1;

	}

	kfree(buffer.pointer);

}



static int acpi_processor_get_performance_control(struct acpi_processor *pr)

{

	int result = 0;

include/acpi/processor.h

+0 −1
Original line number Diff line number Diff line
@@ -225,7 +225,6 @@ struct acpi_processor_errata { 
	} piix4;

};



extern void acpi_processor_load_module(struct acpi_processor *pr);

extern int acpi_processor_preregister_performance(struct

						  acpi_processor_performance

						  __percpu *performance);

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