1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index a5d36ae350dd..00299919df39 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -36,6 +36,8 @@
 
 #define HPWDT_VERSION                   "1.1.1"
 #define SECS_TO_TICKS(secs)             ((secs) * 1000 / 128)
+#define TICKS_TO_SECS(ticks)            ((ticks) * 128 / 1000)
+#define HPWDT_MAX_TIMER                 TICKS_TO_SECS(65535)
 #define DEFAULT_MARGIN                  30
 
 static unsigned int soft_margin = DEFAULT_MARGIN;       /* in seconds */
@@ -432,8 +434,7 @@ static void hpwdt_ping(void)
 
 static int hpwdt_change_timer(int new_margin)
 {
-        /* Arbitrary, can't find the card's limits */
-        if (new_margin < 5 || new_margin > 600) {
+        if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
                 printk(KERN_WARNING
                         "hpwdt: New value passed in is invalid: %d seconds.\n",
                         new_margin);