Zhu Yi wrote, On 06/24/2008 11:05 AM:

On Tue, 2008-06-24 at 10:59 +0200, Johannes Berg wrote:

quoted

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[ INFO: possible circular locking dependency detected ]
2.6.26-rc6-wl #57
-------------------------------------------------------
iw/2763 is trying to acquire lock:
 (genl_mutex){--..}, at: [<ffffffff81216e4c>] ctrl_dumpfamily

+0x31/0xf7

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but task is already holding lock:
 (nlk->cb_mutex){--..}, at: [<ffffffff812137c8>] netlink_dump

+0x40/0x19d

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which lock already depends on the new lock.

None of those is anything nl80211 has influence over, afaict.

Agreed. I can follow the two scenarios below. Apparently it's a ABBA
locking issue. Just don't know which should be the correct sequence for
using with the two locks.

It should be fixed by this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6d1a3fb567a728d31474636e167c324702a0c38b

Regards,
Jarek P.