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cpufreq acpi: only call _PPC after cpufreq ACPI init funcs got called already

Browse source 
Ingo Molnar provided a fix to not call _PPC at processor driver
initialization time in "[PATCH] ACPI: fix cpufreq regression" (git
commit e4233dec74)

But it can still happen that _PPC is called at processor driver
initialization time.

This patch should make sure that this is not possible anymore.

Signed-off-by: Thomas Renninger <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Dave Jones <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Venkatesh Pallipadi <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Thomas Renninger 2008-07-29 22:32:58 -07:00 • committed by Linus Torvalds
commit a1531acd43
4 changed files with 23 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

15
drivers/acpi/processor_perflib.c
View file

@ -64,7 +64,13 @@ static DEFINE_MUTEX(performance_mutex);
* policy is adjusted accordingly.
*/
static unsigned int ignore_ppc = 0;
/* ignore_ppc:
* -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
* ignore _PPC
* 0 -> cpufreq low level drivers initialized -> consider _PPC values
* 1 -> ignore _PPC totally -> forced by user through boot param
*/
static unsigned int ignore_ppc = -1;
module_param(ignore_ppc, uint, 0644);
MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
"limited by BIOS, this should help");
@ -72,7 +78,7 @@ MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
#define PPC_REGISTERED 1
#define PPC_IN_USE 2
static int acpi_processor_ppc_status = 0;
static int acpi_processor_ppc_status;
static int acpi_processor_ppc_notifier(struct notifier_block *nb,
unsigned long event, void *data)
@ -81,6 +87,11 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb,
struct acpi_processor *pr;
unsigned int ppc = 0;
if (event == CPUFREQ_START && ignore_ppc <= 0) {
ignore_ppc = 0;
return 0;
}
if (ignore_ppc)
return 0;

3
drivers/cpufreq/cpufreq.c
View file

@ -825,6 +825,9 @@ static int cpufreq_add_dev(struct sys_device *sys_dev)
policy->user_policy.min = policy->cpuinfo.min_freq;
policy->user_policy.max = policy->cpuinfo.max_freq;
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_START, policy);
#ifdef CONFIG_SMP
#ifdef CONFIG_HOTPLUG_CPU