1 files changed, 8 insertions, 5 deletions

diff --git a/kernel/timer.c b/kernel/timer.c
index be394af5bc22..d8decb8d46b0 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -747,16 +747,19 @@ EXPORT_SYMBOL(mod_timer_pending);
 static inline
 unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
 {
-        unsigned long expires_limit, mask;
+        unsigned long expires_limit, mask, now;
         int bit;
 
         expires_limit = expires;
 
-        if (timer->slack > -1)
+        if (timer->slack >= 0) {
                 expires_limit = expires + timer->slack;
-        else if (time_after(expires, jiffies)) /* auto slack: use 0.4% */
-                expires_limit = expires + (expires - jiffies)/256;
-
+        } else {
+                now = jiffies;
+                /* No slack, if already expired else auto slack 0.4% */
+                if (time_after(expires, now))
+                        expires_limit = expires + (expires - now)/256;
+        }
         mask = expires ^ expires_limit;
         if (mask == 0)
                 return expires;