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Message-ID: <4B6A08C587958942AA3002690DD4F8C31B08093F@cosmail02.lsi.com>
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, ®s->outbound_intr_status);
+ /* Dummy readl to force pci flush */
+ readl(®s->outbound_intr_status);
+
return 0;
}
@@ -293,6 +296,9 @@ megasas_clear_intr_ppc(struct megasas_re
*/
writel(status, ®s->outbound_doorbell_clear);
+ /* Dummy readl to force pci flush */
+ readl(®s->outbound_doorbell_clear);
+
return 0;
}
/**
--
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