linux-kernel - [PATCH 3.19 056/175] megaraid_sas: disable interrupt

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Message-Id: <20150304061035.797603670@linuxfoundation.org>
Date:	Tue,  3 Mar 2015 22:13:54 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Sumit Saxena <sumit.saxena@...gotech.com>,
	Chaitra Basappa <chaitra.basappa@...gotech.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>
Subject: [PATCH 3.19 056/175] megaraid_sas: disable interrupt_mask before enabling hardware interrupts

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Sumit.Saxena@...gotech.com" <Sumit.Saxena@...gotech.com>

commit c2ced1719a1b903350955a511e1666e6d05a7f5b upstream.

Update driver "mask_interrupts" before enable/disable hardware interrupt
in order to avoid missing interrupts because of "mask_interrupts" still
set to 1 and hardware interrupts are enabled.

Signed-off-by: Sumit Saxena <sumit.saxena@...gotech.com>
Signed-off-by: Chaitra Basappa <chaitra.basappa@...gotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/megaraid/megaraid_sas_fusion.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -103,6 +103,8 @@ megasas_enable_intr_fusion(struct megasa
 {
 	struct megasas_register_set __iomem *regs;
 	regs = instance->reg_set;
+
+	instance->mask_interrupts = 0;
 	/* For Thunderbolt/Invader also clear intr on enable */
 	writel(~0, &regs->outbound_intr_status);
 	readl(&regs->outbound_intr_status);
@@ -111,7 +113,6 @@ megasas_enable_intr_fusion(struct megasa
 
 	/* Dummy readl to force pci flush */
 	readl(&regs->outbound_intr_mask);
-	instance->mask_interrupts = 0;
 }
 
 /**


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