Man page 9 : list_first_entry_or_null

list_first_entry_or_null - get the first element from a list

list_first_entry_or_null( ptr , type , member );

ptr
    the list head to take the element from.

type
    the type of the struct this is embedded in.

member
    the name of the list_struct within the struct.

Note that if the list is empty, it returns NULL.