linux-kernel - [ 014/108] hpwdt: Fix kdump issue in hpwdt

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Message-Id: <20121007225836.666663351@decadent.org.uk>
Date:	Sun, 07 Oct 2012 23:58:48 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Toshi Kani <toshi.kani@...com>,
	Lisa Mitchell <lisa.mitchell@...com>,
	Thomas Mingarelli <Thomas.Mingarelli@...com>,
	Wim Van Sebroeck <wim@...ana.be>
Subject: [ 014/108] hpwdt: Fix kdump issue in hpwdt

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

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

From: Toshi Kani <toshi.kani@...com>

commit 308b135e4fcc00c80c07e0e04e7afa8edf78583c upstream.

kdump can be interrupted by watchdog timer when the timer is left
activated on the crash kernel. Changed the hpwdt driver to disable
watchdog timer at boot-time. This assures that watchdog timer is
disabled until /dev/watchdog is opened, and prevents watchdog timer
to be left running on the crash kernel.

Signed-off-by: Toshi Kani <toshi.kani@...com>
Tested-by: Lisa Mitchell <lisa.mitchell@...com>
Signed-off-by: Thomas Mingarelli <Thomas.Mingarelli@...com>
Signed-off-by: Wim Van Sebroeck <wim@...ana.be>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/watchdog/hpwdt.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 1eff743..ae60406 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -814,6 +814,9 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
 	hpwdt_timer_reg = pci_mem_addr + 0x70;
 	hpwdt_timer_con = pci_mem_addr + 0x72;
 
+	/* Make sure that timer is disabled until /dev/watchdog is opened */
+	hpwdt_stop();
+
 	/* Make sure that we have a valid soft_margin */
 	if (hpwdt_change_timer(soft_margin))
 		hpwdt_change_timer(DEFAULT_MARGIN);


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