From: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Date: Thu, 15 Feb 2007 21:12:23 +0000 (-0500)
Subject: ACPICA: fix AML mutex re-entrancy
X-Git-Tag: v2.6.21-rc1~88^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0d127b56937c3e72c2b1819161d2f6718eee877;p=pandora-kernel.git

ACPICA: fix AML mutex re-entrancy

ACPI AML supports "serialized" methods which are protected
by an implicit mutex.  The mutex is re-entrant for that AML thread
to allow recursion.

However, Linux implements notify() by creating a new AML thread.
So for systems where notify() re-enters a serialized method,
deadlock results.

The fix is to use the Linux thread_id as the key to allowing
re-entrancy, not the AML thread pointer.

http://bugzilla.kernel.org/show_bug.cgi?id=5534

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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