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authorRanko Zivojnovic <ranko@spidernet.net>2007-07-16 18:28:32 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-18 01:46:50 -0700
commit0929c2dd83317813425b937fbc0041013b8685ff (patch)
tree00b7dfc35f18dd059b8ea5a6d0a151754c19a974 /net/atm
parentdd121c4bbf60336773485e91b5cfc57596b45151 (diff)
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[NET]: gen_estimator deadlock fix
-Fixes ABBA deadlock noted by Patrick McHardy <kaber@trash.net>: > There is at least one ABBA deadlock, est_timer() does: > read_lock(&est_lock) > spin_lock(e->stats_lock) (which is dev->queue_lock) > > and qdisc_destroy calls htb_destroy under dev->queue_lock, which > calls htb_destroy_class, then gen_kill_estimator and this > write_locks est_lock. To fix the ABBA deadlock the rate estimators are now kept on an rcu list. -The est_lock changes the use from protecting the list to protecting the update to the 'bstat' pointer in order to avoid NULL dereferencing. -The 'interval' member of the gen_estimator structure removed as it is not needed. Signed-off-by: Ranko Zivojnovic <ranko@spidernet.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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