Revision 195648bbc5ae0848e82f771ecf4cd7497054c212 authored by David S. Miller on 19 August 2008, 11:00:36 UTC, committed by David S. Miller on 19 August 2008, 11:00:36 UTC
If dev_deactivate() is trying to quiesce the queue, it is theoretically possible for another cpu to livelock trying to process that queue. This happens because dev_deactivate() grabs the queue spinlock as it checks the queue state, whereas net_tx_action() does a trylock and reschedules the qdisc if it hits the lock. This breaks the livelock by adding a check on __QDISC_STATE_DEACTIVATED to net_tx_action() when the trylock fails. Based upon feedback from Herbert Xu and Jarek Poplawski. Signed-off-by: David S. Miller <davem@davemloft.net>
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