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Subject[PATCH 2/3] watchdog: at91sam9_wdt: avoid spurious watchdog reset during init
Date
Use the min_heartbeat value instead of the calculated heartbeat value for
the first watchdog reset to avoid spurious watchdog reset.

Resetting the watchdog counter during init might lead to a watchdog fault
reset because the watchdog counter has to be running for at least
min_heartbeat.

Resetting the watchdog counter after heartbeat might lead to a watchdog
timeout reset because the watchdog counter is running for more than
max_heartbeat time.

Using min_heartbeat instead of heartbeat does not guarantee that the
watchdog won't trigger a reset, but at least it reduces the chances to be
in such a case.

Signed-off-by: Boris BREZILLON <b.brezillon@overkiz.com>
---
drivers/watchdog/at91sam9_wdt.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
index 65f4691..ab0c4e0 100644
--- a/drivers/watchdog/at91sam9_wdt.c
+++ b/drivers/watchdog/at91sam9_wdt.c
@@ -213,7 +213,15 @@ static int at91_wdt_init(struct platform_device *pdev, struct at91wdt *wdt)
tmp & wdt->mr_mask, wdt->mr & wdt->mr_mask);

setup_timer(&wdt->timer, at91_ping, (unsigned long)wdt);
- mod_timer(&wdt->timer, jiffies + wdt->heartbeat);
+
+ /*
+ * Use min_heartbeat the first time to avoid spurious watchdog reset:
+ * we don't know for how long the watchdog counter is running, and
+ * - resetting it right now might trigger a watchdog fault reset
+ * - waiting for heartbeat time might lead to a watchdog timeout
+ * reset
+ */
+ mod_timer(&wdt->timer, jiffies + min_heartbeat);

/* Try to set timeout from device tree first */
if (watchdog_init_timeout(&wdt->wdd, 0, dev))
--
1.7.9.5


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