From: Jeff Garzik Date: Thu, 18 Oct 2007 06:26:43 +0000 (-0700) Subject: [NET]: fix carrier-on bug? X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bfaae0f04c68bafc12ec50c6922d71a90deea3e2;p=linux-beck.git [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 --- diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 95ae11956f35..e01d57692c9a 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); + } } /**