watchdog: coh901327_wdt.c: fix timeout

Set the timeout value properly so that we don't get faulty values
for the WDIOC_GETTIMEOUT iotcl. 'margin' should be an unsigned int.
Also add a check to see if margin is a valid parameter after it is
loaded as a module.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/watchdog/coh901327_wdt.c b/drivers/watchdog/coh901327_wdt.c
index 7f0cbeb58770..6876430a9f5e 100644
--- a/drivers/watchdog/coh901327_wdt.c
+++ b/drivers/watchdog/coh901327_wdt.c
@@ -67,7 +67,7 @@
 #define U300_WDOG_IFR_WILL_BARK_IRQ_FORCE_ENABLE                        0x0001U
 
 /* Default timeout in seconds = 1 minute */
-static int margin = 60;
+static unsigned int margin = 60;
 static resource_size_t phybase;
 static resource_size_t physize;
 static int irq;
@@ -153,7 +153,7 @@ static void coh901327_disable(void)
 
 static int coh901327_start(struct watchdog_device *wdt_dev)
 {
-        coh901327_enable(margin * 100);
+        coh901327_enable(wdt_dev->timeout * 100);
         return 0;
 }
 
@@ -176,10 +176,10 @@ static int coh901327_ping(struct watchdog_device *wdd)
 static int coh901327_settimeout(struct watchdog_device *wdt_dev,
                                 unsigned int time)
 {
-        margin = time;
+        wdt_dev->timeout = time;
         clk_enable(clk);
         /* Set new timeout value */
-        writew(margin * 100, virtbase + U300_WDOG_TR);
+        writew(time * 100, virtbase + U300_WDOG_TR);
         /* Feed the dog */
         writew(U300_WDOG_FR_FEED_RESTART_TIMER,
                virtbase + U300_WDOG_FR);
@@ -250,7 +250,7 @@ static struct watchdog_device coh901327_wdt = {
         .info = &coh901327_ident,
         .ops = &coh901327_ops,
         /*
-         * Max margin is 327 since the 10ms
+         * Max timeout is 327 since the 10ms
          * timeout register is max
          * 0x7FFF = 327670ms ~= 327s.
          */
@@ -353,6 +353,10 @@ static int __init coh901327_probe(struct platform_device *pdev)
 
         clk_disable(clk);
 
+        if (margin < 1 || margin > 327)
+                margin = 60;
+        coh901327_wdt.timeout = margin;
+
         ret = watchdog_register_device(&coh901327_wdt);
         if (ret == 0)
                 dev_info(&pdev->dev,
@@ -461,7 +465,7 @@ module_exit(coh901327_exit);
 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 MODULE_DESCRIPTION("COH 901 327 Watchdog");
 
-module_param(margin, int, 0);
+module_param(margin, uint, 0);
 MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)");
 
 MODULE_LICENSE("GPL");