From: Tomas Henzl <thenzl@redhat.com>
Date: Mon, 8 Dec 2008 17:48:20 +0100
Subject: [scsi] mpt fusion: disable msi by default
Message-id: 493D4FD4.4020103@redhat.com
O-Subject: [RHEL5.3 PATCH] bz#474465 Calgary DMA errors on IBM systems
Bugzilla: 474465
RH-Acked-by: Prarit Bhargava <prarit@redhat.com>
RH-Acked-by: Pete Zaitcev <zaitcev@redhat.com>

During testing has been found that our system ibm-x3950m2-02.rhts.bos.redhat.com
does not boot with mptbase driver and MSI enabled.
The patch "Update mpt fusion to version 3.04.07" introduced the MSI option
switched on by default.

This patch removes the MSI option switched on by default. I don't know if the
problem is in the controller or in the mainboard. I've also seen other more
sensible approaches on this issue on lkml, but given the fact that it is too late
for every kind of testing I would go with this patch, because it is very
simple.

Tomas

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 8818587..04795a9 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -79,7 +79,7 @@ MODULE_VERSION(my_VERSION);
 /*
  *  cmd line parameters
  */
-static int mpt_msi_enable = -1;
+static int mpt_msi_enable = 0;
 module_param(mpt_msi_enable, int, 0);
 MODULE_PARM_DESC(mpt_msi_enable, " MSI Support Enable (default=0)");