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ACPI: Fix acpi_processor_idle and idle= boot parameters interaction

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acpi_processor_idle and "idle=" boot parameter interaction is broken.
The problem is that, at boot time acpi driver is checking for "idle=" boot
option and not registering the acpi idle handler. But, when there is a CST
changed callback (typically when switching AC <-> battery or suspend-resume)
there are no checks for boot_option_idle_override and acpi idle handler tries
to get installed with nasty side effects.

With CPU_IDLE configured this issue causes results in a nasty oops on CST
change callback and without CPU_IDLE there is no oops, but boot option
of "idle=" gets ignored and acpi idle handler gets installed.

Change the behavior to not do anything in acpi idle handler when there is a
"idle=" boot option.

Note that the problem is only there when "idle=" boot option is used.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venkatesh Pallipadi 2008-04-30 13:57:15 -04:00 committed by Len Brown
parent 0fda6b403f
commit 36a9135865
1 changed files with 12 additions and 2 deletions
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14
drivers/acpi/processor_idle.c
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@ -1299,6 +1299,8 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
{
int result = 0;
if (boot_option_idle_override)
return 0;
if (!pr)
return -EINVAL;
@ -1738,6 +1740,9 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
{
int ret;
if (boot_option_idle_override)
return 0;
if (!pr)
return -EINVAL;
@ -1768,6 +1773,8 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
struct proc_dir_entry *entry = NULL;
unsigned int i;
if (boot_option_idle_override)
return 0;
if (!first_run) {
dmi_check_system(processor_power_dmi_table);
@ -1803,7 +1810,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
* Note that we use previously set idle handler will be used on
* platforms that only support C1.
*/
if ((pr->flags.power) && (!boot_option_idle_override)) {
if (pr->flags.power) {
#ifdef CONFIG_CPU_IDLE
acpi_processor_setup_cpuidle(pr);
pr->power.dev.cpu = pr->id;
@ -1843,8 +1850,11 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
int acpi_processor_power_exit(struct acpi_processor *pr,
struct acpi_device *device)
{
if (boot_option_idle_override)
return 0;
#ifdef CONFIG_CPU_IDLE
if ((pr->flags.power) && (!boot_option_idle_override))
if (pr->flags.power)
cpuidle_unregister_device(&pr->power.dev);
#endif
pr->flags.power_setup_done = 0;