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authorStephen Hemminger <shemminger@osdl.org>2006-05-16 15:02:12 -0700
committerDavid S. Miller <davem@davemloft.net>2006-05-16 15:02:12 -0700
commit338f7566e5c26a9547e25d54863ae4e4e5c856d1 (patch)
treefbe483e07f8680a7718e02b869cdf5e042e2ec7b
parent716f8954fb3029ca2df52a986b60af8d06f093ee (diff)
[PKT_SCHED]: Potential jiffy wrap bug in dev_watchdog().
There is a potential jiffy wraparound bug in the transmit watchdog that is easily avoided by using time_after(). Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/sched/sch_generic.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 31eb83717c2..138ea92ed26 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -193,8 +193,10 @@ static void dev_watchdog(unsigned long arg)
netif_running(dev) &&
netif_carrier_ok(dev)) {
if (netif_queue_stopped(dev) &&
- (jiffies - dev->trans_start) > dev->watchdog_timeo) {
- printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n", dev->name);
+ time_after(jiffies, dev->trans_start + dev->watchdog_timeo)) {
+
+ printk(KERN_INFO "NETDEV WATCHDOG: %s: transmit timed out\n",
+ dev->name);
dev->tx_timeout(dev);
}
if (!mod_timer(&dev->watchdog_timer, jiffies + dev->watchdog_timeo))