Function if_link_state_change

freebsd/net/if.c:2252–2263

* Handle a change in the interface link state. To avoid LORs * between driver lock and upper layer locks, as well as possible * recursions, we post event to taskqueue, and all job * is done in static do_link_state_change(). */

 * is done in static do_link_state_change().
 */
void
if_link_state_change(struct ifnet *ifp, int link_state)
{
	/* Return if state hasn't changed. */
	if (ifp->if_link_state == link_state)
		return;

	ifp->if_link_state = link_state;

	/* XXXGL: reference ifp? */
	taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
}

static void
do_link_state_change(void *arg, int pending)