Re: Fwd: circular lockdep problem

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

On 07/24/2012 12:06 PM, Roland Dreier wrote:
> [resending because I forgot to reply-all]
>
> On Tue, Jul 24, 2012 at 9:39 AM, Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> wrote:
>> Can anyone help me understand how I can resolve this? Its saying there is
>> some circular dependency problem with the cxgb4 uld_mutex, the networking
>> rtnl_mutex, and ib_core's device_mutex. I can't decipher the stuff below
>> though. It only seems to happen when there is a cxgb4 and ipoib device
>> present.
> Do you have a real IB HCA installed too?

Yes.

> I suspect this is a lockdep false positive where it is mixing together
> lock ordering from the IB - IPoIB adapter and the cxgb4 netdev,
> and seeing a deadlock that can't really happen.
>
> I'll take a look, although I don't have a cxgb4 device so I can't test
> directly.  Would you be able to test a patch if I come up with one?

Sure!

Steve.
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