struct pm_dev * pm_find (pm_dev_t type, struct pm_dev * from);
Scan the power management list for devices of a specific type. The return value for a matching device may be passed to further calls to this function to find further matches. A NULL indicates the end of the list.
To search from the beginning pass NULL as the from value.
The caller MUST hold the pm_devs_lock lock when calling this function. The instant that the lock is dropped all pointers returned may become invalid.