From: Yang, Bo <Bo.Yang@lsi.com>
Date: Sun, 10 Aug 2008 19:42:37 +0000 (-0700)
Subject: [SCSI] megaraid_sas: add readl to force PCI posting flush
X-Git-Tag: v2.6.27-rc4~33^2~20
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=06f579dee5dd75c2aaf8fe83d034b5470eeee2f4;p=linux-2.6-omap-h63xx.git

[SCSI] megaraid_sas: add readl to force PCI posting flush

MegaRAID SAS Driver get unexpected Interrupt.  Add the dummy readl to
force PCI flush will fix this issue.

Signed-off-by: Bo Yang <bo.yang@lsi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index fc7ac158476..d7b99843ca3 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -198,6 +198,9 @@ megasas_clear_intr_xscale(struct megasas_register_set __iomem * regs)
 	 */
 	writel(status, &regs->outbound_intr_status);
 
+	/* Dummy readl to force pci flush */
+	readl(&regs->outbound_intr_status);
+
 	return 0;
 }
 
@@ -293,6 +296,9 @@ megasas_clear_intr_ppc(struct megasas_register_set __iomem * regs)
 	 */
 	writel(status, &regs->outbound_doorbell_clear);
 
+	/* Dummy readl to force pci flush */
+	readl(&regs->outbound_doorbell_clear);
+
 	return 0;
 }
 /**