On Thu, 25 Oct 2007, Johannes Berg wrote: > 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? Alan Stern _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
