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PM: Drop pm_flags that is not necessary

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The variable pm_flags is used to prevent APM from being enabled
along with ACPI, which would lead to problems.  However, acpi_init()
is always called before apm_init() and after acpi_init() has
returned, it is known whether or not ACPI will be used.  Namely, if
acpi_disabled is not set after acpi_init() has returned, this means
that ACPI is enabled.  Thus, it is sufficient to check acpi_disabled
in apm_init() to prevent APM from being enabled in parallel with
ACPI.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Rafael J. Wysocki 2011-02-15 21:22:24 +01:00
parent e866500247
commit 6831c6edc7
5 changed files with 7 additions and 48 deletions
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5
arch/x86/kernel/apm_32.c
View File

@ -227,6 +227,7 @@
#include <linux/suspend.h>
#include <linux/kthread.h>
#include <linux/jiffies.h>
#include <linux/acpi.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@ -2331,12 +2332,11 @@ static int __init apm_init(void)
apm_info.disabled = 1;
return -ENODEV;
}
if (pm_flags & PM_ACPI) {
if (!acpi_disabled) {
printk(KERN_NOTICE "apm: overridden by ACPI.\n");
apm_info.disabled = 1;
return -ENODEV;
}
pm_flags |= PM_APM;
/*
* Set up the long jump entry point to the APM BIOS, which is called
@ -2428,7 +2428,6 @@ static void __exit apm_exit(void)
kthread_stop(kapmd_task);
kapmd_task = NULL;
}
pm_flags &= ~PM_APM;
}
module_init(apm_init);

22
drivers/acpi/bus.c
View File

@ -1007,8 +1007,7 @@ struct kobject *acpi_kobj;
static int __init acpi_init(void)
{
int result = 0;
int result;
if (acpi_disabled) {
printk(KERN_INFO PREFIX "Interpreter disabled.\n");
@ -1023,29 +1022,18 @@ static int __init acpi_init(void)
init_acpi_device_notify();
result = acpi_bus_init();
if (!result) {
pci_mmcfg_late_init();
if (pm_apm_enabled()) {
printk(KERN_INFO PREFIX
"APM is already active, exiting\n");
disable_acpi();
result = -ENODEV;
} else {
pm_set_acpi_flag();
}
} else
if (result) {
disable_acpi();
if (acpi_disabled)
return result;
}
pci_mmcfg_late_init();
acpi_scan_init();
acpi_ec_init();
acpi_debugfs_init();
acpi_sleep_proc_init();
acpi_wakeup_device_init();
return result;
return 0;
}
subsys_initcall(acpi_init);

9
include/linux/pm.h
View File

@ -565,15 +565,6 @@ enum dpm_order {
DPM_ORDER_DEV_LAST,
};
/*
* Global Power Management flags
* Used to keep APM and ACPI from both being active
*/
extern unsigned int pm_flags;
#define PM_APM 1
#define PM_ACPI 2
extern int pm_generic_suspend(struct device *dev);
extern int pm_generic_resume(struct device *dev);
extern int pm_generic_freeze(struct device *dev);

6
include/linux/suspend.h
View File

@ -272,9 +272,6 @@ extern int unregister_pm_notifier(struct notifier_block *nb);
register_pm_notifier(&fn##_nb); \
}
extern bool pm_apm_enabled(void);
extern void pm_set_acpi_flag(void);
/* drivers/base/power/wakeup.c */
extern bool events_check_enabled;
@ -295,9 +292,6 @@ static inline int unregister_pm_notifier(struct notifier_block *nb)
#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
static inline bool pm_apm_enabled(void) { return false; }
static inline void pm_set_acpi_flag(void) {}
static inline bool pm_wakeup_pending(void) { return false; }
#endif /* !CONFIG_PM_SLEEP */

13
kernel/power/main.c
View File

@ -19,19 +19,6 @@ DEFINE_MUTEX(pm_mutex);
#ifdef CONFIG_PM_SLEEP
unsigned int pm_flags;
EXPORT_SYMBOL(pm_flags);
bool pm_apm_enabled(void)
{
return !!(pm_flags & PM_APM);
}
void pm_set_acpi_flag(void)
{
pm_flags |= PM_ACPI;
}
/* Routines for PM-transition notifications */
static BLOCKING_NOTIFIER_HEAD(pm_chain_head);