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authorJeff Chua <jeff.chua.linux@gmail.com>2010-05-24 07:16:24 +0800
committerThomas Gleixner <tglx@linutronix.de>2010-05-24 12:10:23 +0200
commitf00e047efdf9d31c8a7dd7875b411f97cfa7d8e5 (patch)
tree4f6af8a7025480aa5d35e438acda9011526406ce
parentbd45b7a385c5ffd82c11a1d51880be18559e5ad9 (diff)
timers: Fix slack calculation for expired timers
commit 3bbb9ec946 (timers: Introduce the concept of timer slack for legacy timers) does not take the case into account when the timer is already expired. This broke wireless drivers. The solution is not to apply slack to already expired timers. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Arjan van de Ven <arjan@linux.intel.com>
-rw-r--r--kernel/timer.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 9199f3c52215..be394af5bc22 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -750,13 +750,14 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
unsigned long expires_limit, mask;
int bit;
- expires_limit = expires + timer->slack;
+ expires_limit = expires;
- if (timer->slack < 0) /* auto slack: use 0.4% */
+ if (timer->slack > -1)
+ expires_limit = expires + timer->slack;
+ else if (time_after(expires, jiffies)) /* auto slack: use 0.4% */
expires_limit = expires + (expires - jiffies)/256;
mask = expires ^ expires_limit;
-
if (mask == 0)
return expires;