linux-kernel - [PATCH 3.4 156/172] hpsa: turn off interrupts when kdump starts

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Date:	Tue, 16 Jun 2015 16:36:50 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Tomas Henzl <thenzl@...hat.com>,
	Don Brace <don.brace@...s.com>, Christoph Hellwig <hch@....de>,
	Vinson Lee <vlee@...pensource.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 156/172] hpsa: turn off interrupts when kdump starts

From: Tomas Henzl <thenzl@...hat.com>

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

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


commit 3b747298786355c6934b0892fc9ae4ca44105192 upstream.

Sometimes when the card is restarted it may cause -
"irq 16: nobody cared (try booting with the "irqpoll" option)"
that is likely caused so, that the card, after the hard reset
finishes, pulls on the irq. Disabling the ints before or after
the hpsa_kdump_hard_reset_controller fixes it.

At this point we can't know in which state the card is,
so using SA5_INTR_OFF + SA5_REPLY_INTR_MASK_OFFSET defines directly,
instead of the function the drivers provides, seems to be apropriate.

Reviewed-by: Scott Teel <scott.teel@...s.com>
Signed-off-by: Don Brace <don.brace@...s.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Cc: Vinson Lee <vlee@...pensource.com>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/scsi/hpsa.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index c45c6a3..cdff47e 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -4055,6 +4055,7 @@ static void __devinit hpsa_hba_inquiry(struct ctlr_info *h)
 static __devinit int hpsa_init_reset_devices(struct pci_dev *pdev)
 {
 	int rc, i;
+	void __iomem *vaddr;
 
 	if (!reset_devices)
 		return 0;
@@ -4076,6 +4077,15 @@ static __devinit int hpsa_init_reset_devices(struct pci_dev *pdev)
 		return -ENODEV;
 	}
 	pci_set_master(pdev);
+
+	vaddr = pci_ioremap_bar(pdev, 0);
+	if (vaddr == NULL) {
+		rc = -ENOMEM;
+		goto out_disable;
+	}
+	writel(SA5_INTR_OFF, vaddr + SA5_REPLY_INTR_MASK_OFFSET);
+	iounmap(vaddr);
+
 	/* Reset the controller with a PCI power-cycle or via doorbell */
 	rc = hpsa_kdump_hard_reset_controller(pdev);
 
-- 
1.9.1

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