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authorTommy S. Christensen <tommy.christensen@tpack.net>2005-05-03 16:18:52 -0700
committerDavid S. Miller <davem@davemloft.net>2005-05-03 16:18:52 -0700
commitcacaddf57ed4d5ca994e9a7e2bd5558061f5d89d (patch)
tree6e4c59a9a27441a3196cbc67a3a79356baa679fb
parent0f4821e7b93fe72e89b8ff393bd8e705bd178aa5 (diff)
[NET]: Disable queueing when carrier is lost.
Some network drivers call netif_stop_queue() when detecting loss of carrier. This leads to packets being queued up at the qdisc level for an unbound period of time. In order to prevent this effect, the core networking stack will now cease to queue packets for any device, that is operationally down (i.e. the queue is flushed and disabled). Signed-off-by: Tommy S. Christensen <tommy.christensen@tpack.net> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/link_watch.c7
-rw-r--r--net/sched/sch_generic.c4
2 files changed, 11 insertions, 0 deletions
diff --git a/net/core/link_watch.c b/net/core/link_watch.c
index 4859b7446c6..d43d1201275 100644
--- a/net/core/link_watch.c
+++ b/net/core/link_watch.c
@@ -16,6 +16,7 @@
#include <linux/netdevice.h>
#include <linux/if.h>
#include <net/sock.h>
+#include <net/pkt_sched.h>
#include <linux/rtnetlink.h>
#include <linux/jiffies.h>
#include <linux/spinlock.h>
@@ -74,6 +75,12 @@ void linkwatch_run_queue(void)
clear_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state);
if (dev->flags & IFF_UP) {
+ if (netif_carrier_ok(dev)) {
+ WARN_ON(dev->qdisc_sleeping == &noop_qdisc);
+ dev_activate(dev);
+ } else
+ dev_deactivate(dev);
+
netdev_state_change(dev);
}
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 8c01e023f02..9a2f8e41a26 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -539,6 +539,10 @@ void dev_activate(struct net_device *dev)
write_unlock_bh(&qdisc_tree_lock);
}
+ if (!netif_carrier_ok(dev))
+ /* Delay activation until next carrier-on event */
+ return;
+
spin_lock_bh(&dev->queue_lock);
rcu_assign_pointer(dev->qdisc, dev->qdisc_sleeping);
if (dev->qdisc != &noqueue_qdisc) {