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[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>
This commit is contained in:
Herbert Xu 2006-05-09 15:27:54 -07:00 committed by David S. Miller
parent 788252e661
commit 8c1056839e
1 changed files with 5 additions and 5 deletions
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10
net/core/link_watch.c
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@ -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);
}
}
}