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ACPI: allow a native cpuidle driver to displace ACPI 

The ACPI driver would fail probe when it found that
another driver had previously registered with cpuidle.

But this is a natural situation, as a native hardware
cpuidle driver should be able to bind instead of ACPI,
and the ACPI processor driver should be able to handle
yielding control of C-states while still handling
P-states and T-states.

Add a KERN_DEBUG line showing when acpi_idle
does successfully register.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2010-05-22 17:03:29 -04:00
parent 752138df0d
commit 541adf7cd9
1 changed files with 6 additions and 5 deletions
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9
drivers/acpi/processor_driver.c
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@ -616,6 +616,7 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device)
acpi_processor_get_limit_info(pr);
if (cpuidle_get_driver() == &acpi_idle_driver)
acpi_processor_power_init(pr, device);
pr->cdev = thermal_cooling_device_register("Processor", device,
@ -920,9 +921,10 @@ static int __init acpi_processor_init(void)
if (!acpi_processor_dir)
return -ENOMEM;
#endif
result = cpuidle_register_driver(&acpi_idle_driver);
if (result < 0)
goto out_proc;
if (!cpuidle_register_driver(&acpi_idle_driver))
printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
acpi_idle_driver.name);
result = acpi_bus_register_driver(&acpi_processor_driver);
if (result < 0)
@ -941,7 +943,6 @@ static int __init acpi_processor_init(void)
out_cpuidle:
cpuidle_unregister_driver(&acpi_idle_driver);
out_proc:
#ifdef CONFIG_ACPI_PROCFS
remove_proc_entry(ACPI_PROCESSOR_CLASS, acpi_root_dir);
#endif