commit 06f579dee5dd75c2aaf8fe83d034b5470eeee2f4
author Yang, Bo <Bo.Yang@lsi.com> Sun Aug 10 12:42:37 2008 -0700
committer James Bottomley <James.Bottomley@HansenPartnership.com> Sat Aug 16 10:12:19 2008 -0500
tree 57e96328d00390037f95a58e1225f1e2099e7bdc
parent d211f052fa58a053639bc51501cb64421157d362

[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>

drivers/scsi/megaraid/megaraid_sas.c

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index fc7ac15..d7b9984 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -198,6 +198,9 @@
 	 */
 	writel(status, &regs->outbound_intr_status);
 
+	/* Dummy readl to force pci flush */
+	readl(&regs->outbound_intr_status);
+
 	return 0;
 }
 
@@ -293,6 +296,9 @@
 	 */
 	writel(status, &regs->outbound_doorbell_clear);
 
+	/* Dummy readl to force pci flush */
+	readl(&regs->outbound_doorbell_clear);
+
 	return 0;
 }
 /**