> > We have two paths here: > > > > (a) sysfs write -> lock buffer -> call power management code > > -> lock pm_mutex > > (b) boot code -> power management boot -> lock pm_mutex > > -> use name_to_dev_t() -> call sysfs -> lock buffer > > > > As you can see, lockdep rightfully complains about a possible deadlock > > scenario although of course (b) only happens once at boot at a time > > where (a) cannot happen. And now we're wondering how to fix it. > > Why not use mutex_lock_nested() for the boot-time pm_mutex lock call? Is that going to help though? I thought lock_nested() is only for nested within a class. johannes
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