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authorJarek Poplawski <jarkao2@gmail.com>2008-03-20 17:05:13 -0700
committerDavid S. Miller <davem@davemloft.net>2008-03-20 17:05:13 -0700
commit94833dfb8c98ed4ca1944dd2c1339d88a2d1c758 (patch)
treec059b5aec8432d82c73f1f3038132f364502d265 /Documentation/dvb
parent38fe999e2286139cccdaa500a81bd49a16a81158 (diff)
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[NET] ifb: set separate lockdep classes for queue locks
[ 10.536424] ======================================================= [ 10.536424] [ INFO: possible circular locking dependency detected ] [ 10.536424] 2.6.25-rc3-devel #3 [ 10.536424] ------------------------------------------------------- [ 10.536424] swapper/0 is trying to acquire lock: [ 10.536424] (&dev->queue_lock){-+..}, at: [<c0299b4a>] dev_queue_xmit+0x175/0x2f3 [ 10.536424] [ 10.536424] but task is already holding lock: [ 10.536424] (&p->tcfc_lock){-+..}, at: [<f8a67154>] tcf_mirred+0x20/0x178 [act_mirred] [ 10.536424] [ 10.536424] which lock already depends on the new lock. lockdep warns of locking order while using ifb with sch_ingress and act_mirred: ingress_lock, tcfc_lock, queue_lock (usually queue_lock is at the beginning). This patch is only to tell lockdep that ifb is a different device (e.g. from eth) and has its own pair of queue locks. (This warning is a false-positive in common scenario of using ifb; yet there are possible situations, when this order could be dangerous; lockdep should warn in such a case.) (With suggestions by David S. Miller) Reported-and-tested-by: Denys Fedoryshchenko <denys@visp.net.lb> Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Acked-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
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