Don't re-initialize the interface if it is already running.
Don't re-initialize the interface if it is already running.

This one line change makes the following code found in many ethernet device drivers
(at least em, igb, ixgbe, and cxgb) gratuitous

	case SIOCSIFADDR:
		if (ifa->ifa_addr->sa_family == AF_INET) {
			/*
			 * XXX
			 * Since resetting hardware takes a very long time
			 * and results in link renegotiation we only
			 * initialize the hardware only when it is absolutely
			 * required.
			 */
			ifp->if_flags |= IFF_UP;
			if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
				EM_CORE_LOCK(adapter);
				em_init_locked(adapter);
				EM_CORE_UNLOCK(adapter);
			}
			arp_ifinit(ifp, ifa);
		} else
			error = ether_ioctl(ifp, command, data);
		break;

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