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| author | David S. Miller <davem@davemloft.net> | 2008-08-19 13:00:36 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-08-19 13:00:36 +0200 |
| commit | 195648bbc5ae0848e82f771ecf4cd7497054c212 (patch) | |
| tree | 644bc8685cab5f83225558888a4398cd0c93c919 /Documentation | |
| parent | Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/holtma... (diff) | |
| download | linux-195648bbc5ae0848e82f771ecf4cd7497054c212.tar.xz linux-195648bbc5ae0848e82f771ecf4cd7497054c212.zip | |
pkt_sched: Prevent livelock in TX queue running.
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>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions