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authorLen Brown <len.brown@intel.com>2010-05-22 17:03:29 -0400
committerLen Brown <len.brown@intel.com>2010-05-27 21:07:04 -0400
commit541adf7cd937b3895c7645406a9b060504df453b (patch)
tree99d6b50aed68071a0aca0957f08bd1b95367fe0c /drivers/acpi
parent752138df0dc2daaae09379c754caeb08c97905dc (diff)
downloadop-kernel-dev-541adf7cd937b3895c7645406a9b060504df453b.zip
op-kernel-dev-541adf7cd937b3895c7645406a9b060504df453b.tar.gz
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/processor_driver.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 5675d97..deefa85 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -616,7 +616,8 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device)
acpi_processor_get_limit_info(pr);
- acpi_processor_power_init(pr, device);
+ if (cpuidle_get_driver() == &acpi_idle_driver)
+ acpi_processor_power_init(pr, device);
pr->cdev = thermal_cooling_device_register("Processor", device,
&processor_cooling_ops);
@@ -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
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