[ 014/108] hpwdt: Fix kdump issue in hpwdt

From: Ben Hutchings
Date: Sun Oct 07 2012 - 19:46:56 EST


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

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

From: Toshi Kani <toshi.kani@xxxxxx>

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@xxxxxx>
Tested-by: Lisa Mitchell <lisa.mitchell@xxxxxx>
Signed-off-by: Thomas Mingarelli <Thomas.Mingarelli@xxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
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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