[patch 1/4] scsi: megaraid_sas: add the dumy readl to force PCI flush

[akpm@xxxxxxxxxxxxxxxxxxxx]

From: "Yang, Bo" <Bo.Yang@xxxxxxx>

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

Signed-off-by: Bo Yang<bo.yang@xxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/scsi/megaraid/megaraid_sas.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff -puN drivers/scsi/megaraid/megaraid_sas.c~scsi-megaraid_sas-add-the-dumy-readl-to-force-pci-flush drivers/scsi/megaraid/megaraid_sas.c
--- a/drivers/scsi/megaraid/megaraid_sas.c~scsi-megaraid_sas-add-the-dumy-readl-to-force-pci-flush
+++ a/drivers/scsi/megaraid/megaraid_sas.c
@@ -198,6 +198,9 @@ megasas_clear_intr_xscale(struct megasas
 	 */
 	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_re
 	 */
 	writel(status, &regs->outbound_doorbell_clear);
 
+	/* Dummy readl to force pci flush */
+	readl(&regs->outbound_doorbell_clear);
+
 	return 0;
 }
 /**
_
--
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