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authorJarek Poplawski <jarkao2@gmail.com>2010-09-02 13:22:11 -0700
committerDavid S. Miller <davem@davemloft.net>2010-09-02 13:22:11 -0700
commit0b5d404e349c0236b11466c0a4785520c0be6982 (patch)
treef4e51049b1433982591204dd67d158ee84808ace /drivers
parent7bcbf81a2296a8f71342445560dcbe16100b567c (diff)
pkt_sched: Fix lockdep warning on est_tree_lock in gen_estimator
This patch fixes a lockdep warning: [ 516.287584] ========================================================= [ 516.288386] [ INFO: possible irq lock inversion dependency detected ] [ 516.288386] 2.6.35b #7 [ 516.288386] --------------------------------------------------------- [ 516.288386] swapper/0 just changed the state of lock: [ 516.288386] (&qdisc_tx_lock){+.-...}, at: [<c12eacda>] est_timer+0x62/0x1b4 [ 516.288386] but this lock took another, SOFTIRQ-unsafe lock in the past: [ 516.288386] (est_tree_lock){+.+...} [ 516.288386] [ 516.288386] and interrupts could create inverse lock ordering between them. ... So, est_tree_lock needs BH protection because it's taken by qdisc_tx_lock, which is used both in BH and process contexts. (Full warning with this patch at netdev, 02 Sep 2010.) Fixes commit: ae638c47dc040b8def16d05dc6acdd527628f231 ("pkt_sched: gen_estimator: add a new lock") Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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