linux-kernel - [097/102] watchdog: shwdt: fix usage of mod

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Date:	Wed, 03 Aug 2011 15:01:57 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	David Engraf <david.engraf@...go.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Wim Van sebroeck <wim@...ana.be>
Subject: [097/102] watchdog: shwdt: fix usage of mod_timer

3.0-stable review patch.  If anyone has any objections, please let us know.

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

From: David Engraf <david.engraf@...go.com>

commit bea1906620ce72b63f83735c4cc2642b25ec54ae upstream.

Fix the usage of mod_timer() and make the driver usable. mod_timer() must
be called with an absolute timeout in jiffies. The old implementation
used a relative timeout thus the hardware watchdog was never triggered.

Signed-off-by: David Engraf <david.engraf@...go.com>
Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
Signed-off-by: Wim Van sebroeck <wim@...ana.be>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/watchdog/shwdt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/watchdog/shwdt.c
+++ b/drivers/watchdog/shwdt.c
@@ -64,7 +64,7 @@
  * misses its deadline, the kernel timer will allow the WDT to overflow.
  */
 static int clock_division_ratio = WTCSR_CKS_4096;
-#define next_ping_period(cks)	msecs_to_jiffies(cks - 4)
+#define next_ping_period(cks)	(jiffies + msecs_to_jiffies(cks - 4))
 
 static const struct watchdog_info sh_wdt_info;
 static struct platform_device *sh_wdt_dev;


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