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PM: ACPI and APM must not be enabled at the same time

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ACPI and APM used "pm_active" to guarantee that
they would not be simultaneously active.

But pm_active was recently moved under CONFIG_PM_LEGACY,
so that without CONFIG_PM_LEGACY, pm_active became a NOP --
allowing ACPI and APM to both be simultaneously enabled.
This caused unpredictable results, including boot hangs.

Further, the code under CONFIG_PM_LEGACY is scheduled
for removal.

So replace pm_active with pm_flags.
pm_flags depends only on CONFIG_PM,
which is present for both CONFIG_APM and CONFIG_ACPI.

http://bugzilla.kernel.org/show_bug.cgi?id=9194

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Len Brown
2007-12-13 17:38:03 -05:00
parent da8cadb31b
commit 9f9adecd2d
6 changed files with 17 additions and 22 deletions
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10
arch/x86/kernel/apm_32.c
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@ -2256,14 +2256,12 @@ static int __init apm_init(void)
apm_info.disabled = 1;
return -ENODEV;
}
if (PM_IS_ACTIVE()) {
if (pm_flags & PM_ACPI) {
printk(KERN_NOTICE "apm: overridden by ACPI.\n");
apm_info.disabled = 1;
return -ENODEV;
}
#ifdef CONFIG_PM_LEGACY
pm_active = 1;
#endif
pm_flags |= PM_APM;
/*
* Set up a segment that references the real mode segment 0x40
@ -2366,9 +2364,7 @@ static void __exit apm_exit(void)
kthread_stop(kapmd_task);
kapmd_task = NULL;
}
#ifdef CONFIG_PM_LEGACY
pm_active = 0;
#endif
pm_flags &= ~PM_APM;
}
module_init(apm_init);