From: Brian King <brking@linux.vnet.ibm.com>
Date: Fri, 23 May 2014 15:52:11 +0000 (-0500)
Subject: ibmvscsi: Add memory barriers for send / receive
X-Git-Tag: v3.2.64~318
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a89c6d3b6c9660ef09bc794135400b2f8f16db8f;p=pandora-kernel.git

ibmvscsi: Add memory barriers for send / receive

commit 7114aae02742d6b5c5a0d39a41deb61d415d3717 upstream.

Add a memory barrier prior to sending a new command to the VIOS
to ensure the VIOS does not receive stale data in the command buffer.
Also add a memory barrier when processing the CRQ for completed commands.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Acked-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
[bwh: Backported to 3.2: as the iSeries code is still present, these
 functions have different names and live in rpa_vscsi.c.]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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