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authorLen Brown <len.brown@intel.com>2007-12-13 17:38:03 -0500
committerLen Brown <len.brown@intel.com>2008-01-11 12:26:47 -0500
commit9f9adecd2d0e4f88fa0e8cb06c6ec207748df70a (patch)
treeb3914860b74a9f6c3ae42016aa708b54040248f8 /arch/x86/kernel/apm_32.c
parentda8cadb31b82c9d41fc593c8deab6aa20b162d6b (diff)
PM: ACPI and APM must not be enabled at the same time
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>
Diffstat (limited to 'arch/x86/kernel/apm_32.c')
-rw-r--r--arch/x86/kernel/apm_32.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c
index 17089a04102..af045ca0f65 100644
--- a/arch/x86/kernel/apm_32.c
+++ b/arch/x86/kernel/apm_32.c
@@ -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);