Messages in this thread | | | Subject | Re: 2.6.17-rc6-mm1/pktcdvd - BUG: possible circular locking | From | Arjan van de Ven <> | Date | Sat, 15 Jul 2006 00:29:13 +0200 |
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> > In the first call chain, do_open -> pkt_open, the bd_mutex object that > is being locked corresponds to a pktcdvd block device, because those > are the only devices that have their open method set to pkt_open. > > In the second call chain, pkt_ctl_ioctl -> pkt_new_dev -> do_open, the > bd_mutex object that is being locked *does not* correspond to a > pktcdvd block device, because pkt_new_dev will bail out with a "Can't > chain pktcdvd devices" error if you call it with "dev" set to a > pktcdvd device. > > Therefore, there is no AB-BA deadlock possibility. The locking > dependencies are A -> B and B -> A', where it is known that A, B and > A' are all different. > > So the claim from the lockdep code, "BUG: possible circular locking > deadlock detected!", is a false alarm.
ok I'll try to find a annotation for that that works - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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