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macvlan: schedule bc_work even if error

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While enqueueing a broadcast skb to port->bc_queue, schedule_work()
is called to add port->bc_work, which processes the skbs in
bc_queue, to "events" work queue. If port->bc_queue is full, the
skb will be discarded and schedule_work(&port->bc_work) won't be
called. However, if port->bc_queue is full and port->bc_work is not
running or pending, port->bc_queue will keep full and schedule_work()
won't be called any more, and all broadcast skbs to macvlan will be
discarded. This case can happen:

macvlan_process_broadcast() is the pending function of port->bc_work,
it moves all the skbs in port->bc_queue to the queue "list", and
processes the skbs in "list". During this, new skbs will keep being
added to port->bc_queue in macvlan_broadcast_enqueue(), and
port->bc_queue may already full when macvlan_process_broadcast()
return. This may happen, especially when there are a lot of real-time
threads and the process is preempted.

Fix this by calling schedule_work(&port->bc_work) even if
port->bc_work is full in macvlan_broadcast_enqueue().

Fixes: 412ca1550c ("macvlan: Move broadcasts into a work queue")
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Menglong Dong 2019-11-25 16:58:09 +08:00 committed by David S. Miller
parent 32085f25d7
commit 1d7ea55668
1 changed files with 2 additions and 1 deletions
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3
drivers/net/macvlan.c
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@ -359,10 +359,11 @@ static void macvlan_broadcast_enqueue(struct macvlan_port *port,
}
spin_unlock(&port->bc_queue.lock);
schedule_work(&port->bc_work);
if (err)
goto free_nskb;
schedule_work(&port->bc_work);
return;
free_nskb: