From: Vegard Nossum <vegard.nossum@gmail.com>
Date: Fri, 20 Jun 2008 13:39:09 +0000 (+0200)
Subject: ACPI: don't walk tables if ACPI was disabled
X-Git-Tag: v2.6.27-rc1~1050^2~65
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1857056904d5f313f11184fcfa624652ff9620a;p=pandora-kernel.git

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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---

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