From: Jeremy Kerr <jeremy.kerr@canonical.com>
Date: Thu, 11 Oct 2012 13:19:11 +0000 (+0800)
Subject: efivarfs: Implement exclusive access for {get,set}_variable
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~16^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f5f6a60ad52fc786c517303590f1efaea614c69b;p=pandora-kernel.git

efivarfs: Implement exclusive access for {get,set}_variable

Currently, efivarfs does not enforce exclusion over the get_variable and
set_variable operations. Section 7.1 of UEFI requires us to only allow a
single processor to enter {get,set}_variable services at once.

This change acquires the efivars->lock over calls to these operations
from the efivarfs paths.

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---

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