linux-kernel - [PATCH 3.13.y-ckt 020/143] megaraid_sas: disable interrupt

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Message-Id: <1427831308-1854-21-git-send-email-kamal@canonical.com>
Date:	Tue, 31 Mar 2015 12:46:25 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sumit Saxena <sumit.saxena@...gotech.com>,
	Chaitra Basappa <chaitra.basappa@...gotech.com>,
	Christoph Hellwig <hch@....de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 020/143] megaraid_sas: disable interrupt_mask before enabling hardware interrupts

3.13.11-ckt18 -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: Kamal Mostafa <kamal@...onical.com>
---
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index f655592..a1f04e3 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -92,6 +92,8 @@ megasas_enable_intr_fusion(struct megasas_instance *instance)
 {
 	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);
@@ -100,7 +102,6 @@ megasas_enable_intr_fusion(struct megasas_instance *instance)
 
 	/* Dummy readl to force pci flush */
 	readl(&regs->outbound_intr_mask);
-	instance->mask_interrupts = 0;
 }
 
 /**
-- 
1.9.1

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