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Re: [PATCH] net: Disable queueing when carrier is lost (take 2)

To: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH] net: Disable queueing when carrier is lost (take 2)
From: Tommy Christensen <tommy.christensen@xxxxxxxxx>
Date: Wed, 04 May 2005 01:28:24 +0200
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <20050503231023.GA18323@gondor.apana.org.au>
References: <4276B13F.2040103@tpack.net> <20050503100306.GB29788@gondor.apana.org.au> <4277FC16.4050307@tpack.net> <20050503231023.GA18323@gondor.apana.org.au>
Sender: netdev-bounce@xxxxxxxxxxx
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Herbert Xu wrote:
Thanks Tommy.  This version looks good to me.  BTW, you probably
should add a Signed-off-by line.

Sigh. I remembered on all but the final patch ... Thanks for helping out.

Signed-off-by: Tommy S. Christensen <tommy.christensen@xxxxxxxxx>
diff -ru linux-2.6.12-rc3/net/core/link_watch.c 
linux-2.6.12-work/net/core/link_watch.c
--- linux-2.6.12-rc3/net/core/link_watch.c      2005-03-04 09:55:42.000000000 
+0100
+++ linux-2.6.12-work/net/core/link_watch.c     2005-05-02 22:40:59.000000000 
+0200
@@ -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 @@
                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 -ru linux-2.6.12-rc3/net/sched/sch_generic.c 
linux-2.6.12-work/net/sched/sch_generic.c
--- linux-2.6.12-rc3/net/sched/sch_generic.c    2005-03-04 09:55:44.000000000 
+0100
+++ linux-2.6.12-work/net/sched/sch_generic.c   2005-05-04 00:24:55.558105856 
+0200
@@ -539,6 +539,10 @@
                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) {
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