linux-kernel - [PATCH 1/4] scsi: megaraid_sas - Add the dumy readl to force PCI flush

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Date:	Fri, 1 Aug 2008 10:19:07 -0600
From:	"Yang, Bo" <Bo.Yang@....com>
To:	"Yang, Bo" <Bo.Yang@....com>,
	"'James.Bottomley@...elEye.com'" <James.Bottomley@...elEye.com>
CC:	"'linux-scsi@...r.kernel.org'" <linux-scsi@...r.kernel.org>,
	"'James.Bottomley@...elEye.com'" <James.Bottomley@...elEye.com>,
	"'akpm@...l.org'" <akpm@...l.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"Patro, Sumant" <Sumant.Patro@....com>,
	"Austria, Winston" <Winston.Austria@....com>,
	"poswald@...ell.com" <poswald@...ell.com>
Subject: [PATCH 1/4] scsi: megaraid_sas - Add the dumy readl to force PCI
 flush

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@....com>

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

diff -rupN linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.c linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.c
--- linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.c      2008-07-31 12:00:58.000000000 -0400
+++ linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.c       2008-07-31 12:30:35.000000000 -0400
@@ -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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