From: Bob Moore <robert.moore@intel.com>
Date: Mon, 9 Mar 2009 08:31:04 +0000 (+0800)
Subject: ACPICA: Fix AcpiWalkNamespace race condition with table unload
X-Git-Tag: v2.6.30-rc1~199^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a335a2331c72e60c6b3ef09b2dedd3ba00da1b1;p=pandora-kernel.git

ACPICA: Fix AcpiWalkNamespace race condition with table unload

Added a reader/writer locking mechanism to allow multiple
concurrent namespace walks (readers), but a dynamic table unload
will have exclusive access to the namespace. This fixes a problem
where a table unload could delete the portion of the namespace that
is currently being examined by a walk.  Adds a new file, utlock.c
that implements the reader/writer lock mechanism. ACPICA BZ 749.

http://www.acpica.org/bugzilla/show_bug.cgi?id=749

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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