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authorWim Van Sebroeck2012-03-23 11:48:22 +0100
committerWim Van Sebroeck2012-03-27 20:16:13 +0200
commitb92c803ec61de59e6e4ab9b2748d8e633cec3f08 (patch)
tree58af22b2fe89531cef7797a86c3de2bba7369b46 /drivers/watchdog
parentd6245842384c9289d4f778555fd8be729e0b0306 (diff)
watchdog: txx9wdt: fix timeout
timeout should be an unsigned int. Set the timeout value properly in the watchdog_device struct so that we don't get an faulty values for the WDIOC_GETTIMEOUT ioctl call. Add check to see that timeout is a valid parameter after it is loaded as a module. Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/txx9wdt.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/watchdog/txx9wdt.c b/drivers/watchdog/txx9wdt.c
index 53f1b17429c6..98e16373e640 100644
--- a/drivers/watchdog/txx9wdt.c
+++ b/drivers/watchdog/txx9wdt.c
@@ -22,10 +22,13 @@
#include <linux/io.h>
#include <asm/txx9tmr.h>
+#define WD_TIMER_CCD 7 /* 1/256 */
+#define WD_TIMER_CLK (clk_get_rate(txx9_imclk) / (2 << WD_TIMER_CCD))
+#define WD_MAX_TIMEOUT ((0xffffffff >> (32 - TXX9_TIMER_BITS)) / WD_TIMER_CLK)
#define TIMER_MARGIN 60 /* Default is 60 seconds */
-static int timeout = TIMER_MARGIN; /* in seconds */
-module_param(timeout, int, 0);
+static unsigned int timeout = TIMER_MARGIN; /* in seconds */
+module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout,
"Watchdog timeout in seconds. "
"(0<timeout<((2^" __MODULE_STRING(TXX9_TIMER_BITS) ")/(IMCLK/256)), "
@@ -37,10 +40,6 @@ MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started "
"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-#define WD_TIMER_CCD 7 /* 1/256 */
-#define WD_TIMER_CLK (clk_get_rate(txx9_imclk) / (2 << WD_TIMER_CCD))
-#define WD_MAX_TIMEOUT ((0xffffffff >> (32 - TXX9_TIMER_BITS)) / WD_TIMER_CLK)
-
static struct txx9_tmr_reg __iomem *txx9wdt_reg;
static struct clk *txx9_imclk;
static DEFINE_SPINLOCK(txx9_lock);
@@ -56,7 +55,7 @@ static int txx9wdt_ping(struct watchdog_device *wdt_dev)
static int txx9wdt_start(struct watchdog_device *wdt_dev)
{
spin_lock(&txx9_lock);
- __raw_writel(WD_TIMER_CLK * timeout, &txx9wdt_reg->cpra);
+ __raw_writel(WD_TIMER_CLK * wdt_dev->timeout, &txx9wdt_reg->cpra);
__raw_writel(WD_TIMER_CCD, &txx9wdt_reg->ccdr);
__raw_writel(0, &txx9wdt_reg->tisr); /* clear pending interrupt */
__raw_writel(TXx9_TMTCR_TCE | TXx9_TMTCR_CCDE | TXx9_TMTCR_TMODE_WDOG,
@@ -79,7 +78,7 @@ static int txx9wdt_stop(struct watchdog_device *wdt_dev)
static int txx9wdt_set_timeout(struct watchdog_device *wdt_dev,
unsigned int new_timeout)
{
- timeout = new_timeout;
+ wdt_dev->timeout = new_timeout;
txx9wdt_stop(wdt_dev);
txx9wdt_start(wdt_dev);
return 0;
@@ -128,6 +127,9 @@ static int __init txx9wdt_probe(struct platform_device *dev)
goto exit;
}
+ if (timeout < 1 || timeout > WD_MAX_TIMEOUT)
+ timeout = TIMER_MARGIN;
+ txx9wdt.timeout = timeout;
txx9wdt.min_timeout = 1;
txx9wdt.max_timeout = WD_MAX_TIMEOUT;
watchdog_set_nowayout(&txx9wdt, nowayout);