ACPI: don't walk tables if ACPI was disabled
Ingo Molnar wrote: > -tip auto-testing started triggering this spinlock corruption message > yesterday: > > [ 3.976213] calling acpi_rtc_init+0x0/0xd3 > [ 3.980213] ACPI Exception (utmutex-0263): AE_BAD_PARAMETER, Thread F7C50000 could not acquire Mutex [3] [20080321] > [ 3.992213] BUG: spinlock bad magic on CPU#0, swapper/1 > [ 3.992213] lock: c2508dc4, .magic: 00000000, .owner: swapper/1, .owner_cpu: 0 This is apparently because some parts of ACPI, including mutexes, are not initialized when acpi=off is passed to the kernel. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Len Brown <len.brown@intel.com>
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@ -333,6 +333,9 @@ static int __init acpi_rtc_init(void)
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{
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{
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struct device *dev = get_rtc_dev();
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struct device *dev = get_rtc_dev();
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if (acpi_disabled)
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return 0;
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if (dev) {
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if (dev) {
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rtc_wake_setup();
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rtc_wake_setup();
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rtc_info.wake_on = rtc_wake_on;
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rtc_info.wake_on = rtc_wake_on;
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