From: Ralph Campbell <ralph.campbell@qlogic.com>
Date: Fri, 6 Jul 2007 19:48:23 +0000 (-0700)
Subject: IB/ipath: Add barrier before updating WC head in shared memory
X-Git-Tag: v2.6.23-rc1~1085^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4fc570bcbe77f823aae183dd824869f79e74cc97;p=pandora-kernel.git

IB/ipath: Add barrier before updating WC head in shared memory

Add a barrier to make sure the CPU doesn't reorder writes to memory,
since user programs can be polling on the head index update and the
entry should be written before that.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
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