Re: INFO: possible circular locking dependency at cleanup_workqueue_thread

[Johannes Berg]

On Wed, 2009-05-20 at 11:36 +0800, Ming Lei wrote:

> > Anyway, you can have a deadlock like this:
> >
> > CPU 3                   CPU 2                           CPU 1
> >                                                        suspend/hibernate
> >                        something:
> >                        rtnl_lock()                     device_pm_lock()
> >                                                        -> mutex_lock(&dpm_list_mtx)
> >
> >                        mutex_lock(&dpm_list_mtx)
> 
> Would you give a explaination why mutex_lock(&dpm_list_mtx) runs in CPU2
> and depends on rtnl_lock?

Why not? Something is registering a hotplugged netdev.

johannes

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