From: David Howells <dhowells@redhat.com>
Date: Tue, 17 Jan 2012 20:39:40 +0000 (+0000)
Subject: KEYS: Add missing smp_rmb() primitives to the keyring search code
X-Git-Tag: v3.3-rc1~22^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=efde8b6e16f11e7d1681c68d86c7fd51053cada7;p=pandora-kernel.git

KEYS: Add missing smp_rmb() primitives to the keyring search code

Add missing smp_rmb() primitives to the keyring search code.

When keyring payloads are appended to without replacement (thus using up spare
slots in the key pointer array), an smp_wmb() is issued between the pointer
assignment and the increment of the key count (nkeys).

There should be corresponding read barriers between the read of nkeys and
dereferences of keys[n] when n is dependent on the value of nkeys.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
---

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