net: allow netif_carrier to be called safely from IRQ
authorstephen hemminger <shemminger@vyatta.com>
Fri, 22 Jul 2011 12:53:56 +0000 (12:53 +0000)
committerDavid S. Miller <davem@davemloft.net>
Sat, 23 Jul 2011 00:01:14 +0000 (17:01 -0700)
As reported by Ben Greer and Froncois Romieu. The code path in
the netif_carrier code leads it to try and disable
a late workqueue to reenable it immediately
netif_carrier_on
-> linkwatch_fire_event
   -> linkwatch_schedule_work
      -> cancel_delayed_work
         -> del_timer_sync

If __cancel_delayed_work is used instead then there is no
problem of waiting for running linkwatch_event.

There is a race between linkwatch_event running re-scheduling
but it is harmless to schedule an extra scan of the linkwatch queue.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/link_watch.c

index a7b3421318696e0e8dc596f19658774810f44a59..357bd4ee4baa324f1402ae3d7a44c37ce4d1e46e 100644 (file)
@@ -126,7 +126,7 @@ static void linkwatch_schedule_work(int urgent)
                return;
 
        /* It's already running which is good enough. */
-       if (!cancel_delayed_work(&linkwatch_work))
+       if (!__cancel_delayed_work(&linkwatch_work))
                return;
 
        /* Otherwise we reschedule it again for immediate execution. */