tree 31c505b9957d82125cd7e779d83da0d389f9d336
parent 5e739d1752aca4e8f3e794d431503bfca3162df4
author Jarek Poplawski <jarkao2@gmail.com> 1219320674 -0700
committer David S. Miller <davem@davemloft.net> 1219320674 -0700

pkt_sched: Fix qdisc_watchdog() vs. dev_deactivate() race

dev_deactivate() can skip rescheduling of a qdisc by qdisc_watchdog()
or other timer calling netif_schedule() after dev_queue_deactivate().
We prevent this checking aliveness before scheduling the timer. Since
during deactivation the root qdisc is available only as qdisc_sleeping
additional accessor qdisc_root_sleeping() is created.

With feedback from Herbert Xu <herbert@gondor.apana.org.au>

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>