Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=bfaae0f04c68bafc12ec50c6922d71a90deea3e2
Commit: bfaae0f04c68bafc12ec50c6922d71a90deea3e2
Parent: 45542479fb261342d5244869cf3ca4636b7ffd43
Author: Jeff Garzik <[EMAIL PROTECTED]>
AuthorDate: Wed Oct 17 23:26:43 2007 -0700
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Oct 17 23:26:43 2007 -0700
[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 <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
net/sched/sch_generic.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 95ae119..e01d576 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);
+ }
}
/**
-
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