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| author | Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | 2008-04-30 13:57:15 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-04-30 13:57:15 -0400 |
| commit | 36a913586597cab1cd565e9bf348d037f0df955b (patch) | |
| tree | 16466b07b7edc2c53357c2e00e39164dabc95af9 /drivers | |
| parent | 0fda6b403f0eca66ad8a7c946b3996e359100443 (diff) | |
| download | lwn-36a913586597cab1cd565e9bf348d037f0df955b.tar.gz lwn-36a913586597cab1cd565e9bf348d037f0df955b.zip | |
ACPI: Fix acpi_processor_idle and idle= boot parameters interaction
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/processor_idle.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 836362b50faa..47b167c731a0 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -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; |