From bfaae0f04c68bafc12ec50c6922d71a90deea3e2 Mon Sep 17 00:00:00 2001 From: Jeff Garzik Date: Wed, 17 Oct 2007 23:26:43 -0700 Subject: [PATCH] [NET]: fix carrier-on bug? While looking at a net driver with the following construct, if (!netif_carrier_ok(dev)) netif_carrier_on(dev); it stuck me that the netif_carrier_ok() check was redundant, since netif_carrier_on() checks bit __LINK_STATE_NOCARRIER anyway. This is the same reason why netif_queue_stopped() need not be called prior to netif_wake_queue(). This is true, but there is however an unwanted side effect from assuming that netif_carrier_on() can be called multiple times: it touches the watchdog, regardless of pre-existing carrier state. The fix: move watchdog-up inside the bit-cleared code path. Signed-off-by: Jeff Garzik Signed-off-by: David S. Miller --- net/sched/sch_generic.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 95ae11956f..e01d57692c 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -249,10 +249,11 @@ static void dev_watchdog_down(struct net_device *dev) */ void netif_carrier_on(struct net_device *dev) { - if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) + if (test_and_clear_bit(__LINK_STATE_NOCARRIER, &dev->state)) { linkwatch_fire_event(dev); - if (netif_running(dev)) - __netdev_watchdog_up(dev); + if (netif_running(dev)) + __netdev_watchdog_up(dev); + } } /** -- 2.39.5