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authorHerbert Xu <herbert@gondor.apana.org.au>2006-05-09 15:27:54 -0700
committerDavid S. Miller <davem@davemloft.net>2006-05-09 15:27:54 -0700
commit8c1056839e808aad728db86d739ffec71d2d1db8 (patch)
treea6ba76eedc0b570314be5be71017575ec91e74cd /net
parent788252e6616afc75098397cc6b0bcb5482ad07ac (diff)
downloadlinux-stericsson-8c1056839e808aad728db86d739ffec71d2d1db8.tar.gz
[NET] linkwatch: Handle jiffies wrap-around
The test used in the linkwatch does not handle wrap-arounds correctly. Since the intention of the code is to eliminate bursts of messages we can afford to delay things up to a second. Using that fact we can easily handle wrap-arounds by making sure that we don't delay things by more than one second. This is based on diagnosis and a patch by Stefan Rompf. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Stefan Rompf <stefan@loplof.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/link_watch.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/core/link_watch.c b/net/core/link_watch.c
index 341de44c7ed1..646937cc2d84 100644
--- a/net/core/link_watch.c
+++ b/net/core/link_watch.c
@@ -170,13 +170,13 @@ void linkwatch_fire_event(struct net_device *dev)
spin_unlock_irqrestore(&lweventlist_lock, flags);
if (!test_and_set_bit(LW_RUNNING, &linkwatch_flags)) {
- unsigned long thisevent = jiffies;
+ unsigned long delay = linkwatch_nextevent - jiffies;
- if (thisevent >= linkwatch_nextevent) {
+ /* If we wrap around we'll delay it by at most HZ. */
+ if (!delay || delay > HZ)
schedule_work(&linkwatch_work);
- } else {
- schedule_delayed_work(&linkwatch_work, linkwatch_nextevent - thisevent);
- }
+ else
+ schedule_delayed_work(&linkwatch_work, delay);
}
}
}