[NET]: Transform skb_queue_len() binary tests into skb_queue_empty()

This is part of the grand scheme to eliminate the qlen
member of skb_queue_head, and subsequently remove the
'list' member of sk_buff.

Most users of skb_queue_len() want to know if the queue is
empty or not, and that's trivially done with skb_queue_empty()
which doesn't use the skb_queue_head->qlen member and instead
uses the queue list emptyness as the test.

Signed-off-by: David S. Miller <[e-mail]>

drivers/bluetooth/hci_vhci.c

···
 
 	poll_wait(file, &hci_vhci->read_wait, wait);
  
-	if (skb_queue_len(&hci_vhci->readq))
+	if (!skb_queue_empty(&hci_vhci->readq))
 		return POLLIN | POLLRDNORM;
 
 	return POLLOUT | POLLWRNORM;

drivers/isdn/hisax/isdnl1.c

···
 	if (test_and_clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags))
 		st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
 	if (!test_bit(BC_FLG_ACTIV, &bcs->Flag)) {
-		if (!test_bit(BC_FLG_BUSY, &bcs->Flag) && (!skb_queue_len(&bcs->squeue))) {
+		if (!test_bit(BC_FLG_BUSY, &bcs->Flag) &&
+		    skb_queue_empty(&bcs->squeue)) {
 			st->l2.l2l1(st, PH_DEACTIVATE | CONFIRM, NULL);
 		}
 	}

drivers/isdn/hisax/isdnl2.c

···
 static void
 set_peer_busy(struct Layer2 *l2) {
 	test_and_set_bit(FLG_PEER_BUSY, &l2->flag);
-	if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue))
+	if (!skb_queue_empty(&l2->i_queue) ||
+	    !skb_queue_empty(&l2->ui_queue))
 		test_and_set_bit(FLG_L2BLOCK, &l2->flag);
 }
 
···
 		st->l2.l2l3(st, DL_ESTABLISH | INDICATION, NULL);
 
 	if ((ST_L2_7==state) || (ST_L2_8 == state))
-		if (skb_queue_len(&st->l2.i_queue) && cansend(st))
+		if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
 			st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
 }
 
···
 	if (pr != -1)
 		st->l2.l2l3(st, pr, NULL);
 
-	if (skb_queue_len(&st->l2.i_queue) && cansend(st))
+	if (!skb_queue_empty(&st->l2.i_queue) && cansend(st))
 		st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
 }
 
···
 			if(typ != RR) FsmDelTimer(&st->l2.t203, 9);
 			restart_t200(st, 12);
 		}
-		if (skb_queue_len(&st->l2.i_queue) && (typ == RR))
+		if (!skb_queue_empty(&st->l2.i_queue) && (typ == RR))
 			st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
 	} else
 		nrerrorrecovery(fi);
···
 		return;
 	}
 
-	if (skb_queue_len(&st->l2.i_queue) && (fi->state == ST_L2_7))
+	if (!skb_queue_empty(&st->l2.i_queue) && (fi->state == ST_L2_7))
 		st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
 	if (test_and_clear_bit(FLG_ACK_PEND, &st->l2.flag))
 		enquiry_cr(st, RR, RSP, 0);
···
 		test_and_set_bit(FLG_L3_INIT, &st->l2.flag);
 	} else
 		FsmChangeState(fi, ST_L2_4);
-	if (skb_queue_len(&st->l2.ui_queue))
+	if (!skb_queue_empty(&st->l2.ui_queue))
 		tx_ui(st);
 }
 
···
 		FsmDelTimer(&st->l2.t203, 13);
 		FsmAddTimer(&st->l2.t200, st->l2.T200, EV_L2_T200, NULL, 11);
 	}
-	if (skb_queue_len(&l2->i_queue) && cansend(st))
+	if (!skb_queue_empty(&l2->i_queue) && cansend(st))
 		st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
 }
 
···
 			}
 			invoke_retransmission(st, nr);
 			FsmChangeState(fi, ST_L2_7);
-			if (skb_queue_len(&l2->i_queue) && cansend(st))
+			if (!skb_queue_empty(&l2->i_queue) && cansend(st))
 				st->l2.l2l1(st, PH_PULL | REQUEST, NULL);
 		} else
 			nrerrorrecovery(fi);

drivers/isdn/hisax/isdnl3.c

···
 				!test_bit(FLG_PTP, &p->st->l2.flag)) {
 				if (p->debug)
 					l3_debug(p->st, "release_l3_process: last process");
-				if (!skb_queue_len(&p->st->l3.squeue)) {
+				if (skb_queue_empty(&p->st->l3.squeue)) {
 					if (p->debug)
 						l3_debug(p->st, "release_l3_process: release link");
 					if (p->st->protocol != ISDN_PTYPE_NI1)

drivers/isdn/i4l/isdn_tty.c

···
 		total += c;
 	}
 	atomic_dec(&info->xmit_lock);
-	if ((info->xmit_count) || (skb_queue_len(&info->xmit_queue))) {
+	if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue)) {
 		if (m->mdmreg[REG_DXMT] & BIT_DXMT) {
 			isdn_tty_senddown(info);
 			isdn_tty_tint(info);
···
 
 	if (isdn_tty_paranoia_check(info, tty->name, "isdn_tty_flush_chars"))
 		return;
-	if ((info->xmit_count) || (skb_queue_len(&info->xmit_queue)))
+	if ((info->xmit_count) || !skb_queue_empty(&info->xmit_queue))
 		isdn_timer_ctrl(ISDN_TIMER_MODEMXMIT, 1);
 }
 

drivers/isdn/icn/icn.c

···
 	isdn_ctrl cmd;
 
 	if (!(card->sndcount[channel] || card->xskb[channel] ||
-	      skb_queue_len(&card->spqueue[channel])))
+	      !skb_queue_empty(&card->spqueue[channel])))
 		return;
 	if (icn_trymaplock_channel(card, mch)) {
 		while (sbfree && 
 		       (card->sndcount[channel] ||
-			skb_queue_len(&card->spqueue[channel]) ||
+			!skb_queue_empty(&card->spqueue[channel]) ||
 			card->xskb[channel])) {
 			spin_lock_irqsave(&card->lock, flags);
 			if (card->xmit_lock[channel]) {

drivers/net/hamradio/scc.c

···
 		scc->tx_buff = NULL;
 	}
 	
-	while (skb_queue_len(&scc->tx_queue))
+	while (!skb_queue_empty(&scc->tx_queue))
 		dev_kfree_skb(skb_dequeue(&scc->tx_queue));
 
 	spin_unlock_irqrestore(&scc->lock, flags);
···
 	
 	if (scc->stat.tx_state == TXS_WAIT)	/* maxkeyup or idle timeout */
 	{
-		if (skb_queue_len(&scc->tx_queue) == 0)	/* nothing to send */
-		{
+		if (skb_queue_empty(&scc->tx_queue)) {	/* nothing to send */
 			scc->stat.tx_state = TXS_IDLE;
 			netif_wake_queue(scc->dev);	/* t_maxkeyup locked it. */
 			return;

drivers/net/ppp_async.c

···
 	spin_lock_irqsave(&ap->recv_lock, flags);
 	ppp_async_input(ap, buf, cflags, count);
 	spin_unlock_irqrestore(&ap->recv_lock, flags);
-	if (skb_queue_len(&ap->rqueue))
+	if (!skb_queue_empty(&ap->rqueue))
 		tasklet_schedule(&ap->tsk);
 	ap_put(ap);
 	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)

drivers/net/ppp_generic.c

···
 		pch = list_entry(list, struct channel, clist);
 		navail += pch->avail = (pch->chan != NULL);
 		if (pch->avail) {
-			if (skb_queue_len(&pch->file.xq) == 0
-			    || !pch->had_frag) {
+			if (skb_queue_empty(&pch->file.xq) ||
+			    !pch->had_frag) {
 				pch->avail = 2;
 				++nfree;
 			}
···
 
 		/* try to send it down the channel */
 		chan = pch->chan;
-		if (skb_queue_len(&pch->file.xq)
-		    || !chan->ops->start_xmit(chan, frag))
+		if (!skb_queue_empty(&pch->file.xq) ||
+		    !chan->ops->start_xmit(chan, frag))
 			skb_queue_tail(&pch->file.xq, frag);
 		pch->had_frag = 1;
 		p += flen;
···
 
 	spin_lock_bh(&pch->downl);
 	if (pch->chan != 0) {
-		while (skb_queue_len(&pch->file.xq) > 0) {
+		while (!skb_queue_empty(&pch->file.xq)) {
 			skb = skb_dequeue(&pch->file.xq);
 			if (!pch->chan->ops->start_xmit(pch->chan, skb)) {
 				/* put the packet back and try again later */
···
 	}
 	spin_unlock_bh(&pch->downl);
 	/* see if there is anything from the attached unit to be sent */
-	if (skb_queue_len(&pch->file.xq) == 0) {
+	if (skb_queue_empty(&pch->file.xq)) {
 		read_lock_bh(&pch->upl);
 		ppp = pch->ppp;
 		if (ppp != 0)

drivers/net/ppp_synctty.c

···
 	spin_lock_irqsave(&ap->recv_lock, flags);
 	ppp_sync_input(ap, buf, cflags, count);
 	spin_unlock_irqrestore(&ap->recv_lock, flags);
-	if (skb_queue_len(&ap->rqueue))
+	if (!skb_queue_empty(&ap->rqueue))
 		tasklet_schedule(&ap->tsk);
 	sp_put(ap);
 	if (test_and_clear_bit(TTY_THROTTLED, &tty->flags)

drivers/net/tun.c

···
 
 	poll_wait(file, &tun->read_wait, wait);
  
-	if (skb_queue_len(&tun->readq))
+	if (!skb_queue_empty(&tun->readq))
 		mask |= POLLIN | POLLRDNORM;
 
 	return mask;

drivers/net/wireless/airo.c

···
 	/*
 	 * Clean out tx queue
 	 */
-	if (test_bit(FLAG_MPI, &ai->flags) && skb_queue_len (&ai->txq) > 0) {
+	if (test_bit(FLAG_MPI, &ai->flags) && !skb_queue_empty(&ai->txq)) {
 		struct sk_buff *skb = NULL;
 		for (;(skb = skb_dequeue(&ai->txq));)
 			dev_kfree_skb(skb);
···
 				if (status & EV_TXEXC)
 					get_tx_error(apriv, -1);
 				spin_lock_irqsave(&apriv->aux_lock, flags);
-				if (skb_queue_len (&apriv->txq)) {
+				if (!skb_queue_empty(&apriv->txq)) {
 					spin_unlock_irqrestore(&apriv->aux_lock,flags);
 					mpi_send_packet (dev);
 				} else {

drivers/s390/net/claw.c

···
 	new_skb = NULL;		/* assume no dice */
 	pkt_cnt = 0;
 	CLAW_DBF_TEXT(4,trace,"PackSKBe");
-	if (skb_queue_len(&p_ch->collect_queue) > 0) {
+	if (!skb_queue_empty(&p_ch->collect_queue)) {
 	/* some data */
 		held_skb = skb_dequeue(&p_ch->collect_queue);
 		if (p_env->packing != DO_PACKED)
···
 	privptr = (struct claw_privbk *) dev->priv;
         claw_free_wrt_buf( dev );
 	if ((privptr->write_free_count > 0) &&
-	    (skb_queue_len(&p_ch->collect_queue) > 0)) {
+	    !skb_queue_empty(&p_ch->collect_queue)) {
 	  	pk_skb = claw_pack_skb(privptr);
 		while (pk_skb != NULL) {
 			rc = claw_hw_tx( pk_skb, dev,1);

drivers/s390/net/ctctty.c

···
 					skb_queue_head(&info->rx_queue, skb);
 				else {
 					kfree_skb(skb);
-					ret = skb_queue_len(&info->rx_queue);
+					ret = !skb_queue_empty(&info->rx_queue);
 				}
 			}
 		}
···
 		total += c;
 		count -= c;
 	}
-	if (skb_queue_len(&info->tx_queue)) {
+	if (!skb_queue_empty(&info->tx_queue)) {
 		info->lsr &= ~UART_LSR_TEMT;
 		tasklet_schedule(&info->tasklet);
 	}
···
 		return;
 	if (ctc_tty_paranoia_check(info, tty->name, "ctc_tty_flush_chars"))
 		return;
-	if (tty->stopped || tty->hw_stopped || (!skb_queue_len(&info->tx_queue)))
+	if (tty->stopped || tty->hw_stopped || skb_queue_empty(&info->tx_queue))
 		return;
 	tasklet_schedule(&info->tasklet);
 }

drivers/usb/net/usbnet.c

···
 	temp = unlink_urbs (dev, &dev->txq) + unlink_urbs (dev, &dev->rxq);
 
 	// maybe wait for deletions to finish.
-	while (skb_queue_len (&dev->rxq)
-			&& skb_queue_len (&dev->txq)
-			&& skb_queue_len (&dev->done)) {
+	while (!skb_queue_empty(&dev->rxq) &&
+	       !skb_queue_empty(&dev->txq) &&
+	       !skb_queue_empty(&dev->done)) {
 		msleep(UNLINK_TIMEOUT_MS);
 		if (netif_msg_ifdown (dev))
 			devdbg (dev, "waited for %d urb completions", temp);

include/net/irda/irda_device.h

···
 /* Interface for internal use */
 static inline int irda_device_txqueue_empty(const struct net_device *dev)
 {
-	return (skb_queue_len(&dev->qdisc->q) == 0);
+	return skb_queue_empty(&dev->qdisc->q);
 }
 int  irda_device_set_raw_mode(struct net_device* self, int status);
 struct net_device *alloc_irdadev(int sizeof_priv);

include/net/tcp.h

···
 
 static inline void tcp_fast_path_check(struct sock *sk, struct tcp_sock *tp)
 {
-	if (skb_queue_len(&tp->out_of_order_queue) == 0 &&
+	if (skb_queue_empty(&tp->out_of_order_queue) &&
 	    tp->rcv_wnd &&
 	    atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf &&
 	    !tp->urg_data)

net/bluetooth/cmtp/core.c

···
 	return kernel_sendmsg(sock, &msg, &iv, 1, len);
 }
 
-static int cmtp_process_transmit(struct cmtp_session *session)
+static void cmtp_process_transmit(struct cmtp_session *session)
 {
 	struct sk_buff *skb, *nskb;
 	unsigned char *hdr;
···
 
 	if (!(nskb = alloc_skb(session->mtu, GFP_ATOMIC))) {
 		BT_ERR("Can't allocate memory for new frame");
-		return -ENOMEM;
+		return;
 	}
 
 	while ((skb = skb_dequeue(&session->transmit))) {
···
 	cmtp_send_frame(session, nskb->data, nskb->len);
 
 	kfree_skb(nskb);
-
-	return skb_queue_len(&session->transmit);
 }
 
 static int cmtp_session(void *arg)

net/bluetooth/hidp/core.c

···
 	return kernel_sendmsg(sock, &msg, &iv, 1, len);
 }
 
-static int hidp_process_transmit(struct hidp_session *session)
+static void hidp_process_transmit(struct hidp_session *session)
 {
 	struct sk_buff *skb;
 
···
 		hidp_set_timer(session);
 		kfree_skb(skb);
 	}
-
-	return skb_queue_len(&session->ctrl_transmit) +
-				skb_queue_len(&session->intr_transmit);
 }
 
 static int hidp_session(void *arg)

net/bluetooth/rfcomm/sock.c

···
 	for (;;) {
 		set_current_state(TASK_INTERRUPTIBLE);
 
-		if (skb_queue_len(&sk->sk_receive_queue) || sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN) ||
-				signal_pending(current) || !timeo)
+		if (!skb_queue_empty(&sk->sk_receive_queue) ||
+		    sk->sk_err ||
+		    (sk->sk_shutdown & RCV_SHUTDOWN) ||
+		    signal_pending(current) ||
+		    !timeo)
 			break;
 
 		set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);

net/bluetooth/rfcomm/tty.c

···
 
 	BT_DBG("tty %p dev %p", tty, dev);
 
-	if (skb_queue_len(&dlc->tx_queue))
+	if (!skb_queue_empty(&dlc->tx_queue))
 		return dlc->mtu;
 
 	return 0;

net/decnet/af_decnet.c

···
 	 * we are double checking that we are not sending too
 	 * many of these keepalive frames.
 	 */
-	if (skb_queue_len(&scp->other_xmit_queue) == 0)
+	if (skb_queue_empty(&scp->other_xmit_queue))
 		dn_nsp_send_link(sk, DN_NOCHANGE, 0);
 }
 
···
 	struct dn_scp *scp = DN_SK(sk);
 	int mask = datagram_poll(file, sock, wait);
 
-	if (skb_queue_len(&scp->other_receive_queue))
+	if (!skb_queue_empty(&scp->other_receive_queue))
 		mask |= POLLRDBAND;
 
 	return mask;
···
 
 	case SIOCATMARK:
 		lock_sock(sk);
-		val = (skb_queue_len(&scp->other_receive_queue) != 0);
+		val = !skb_queue_empty(&scp->other_receive_queue);
 		if (scp->state != DN_RUN)
 			val = -ENOTCONN;
 		release_sock(sk);
···
 	int len = 0;
 
 	if (flags & MSG_OOB)
-		return skb_queue_len(q) ? 1 : 0;
+		return !skb_queue_empty(q) ? 1 : 0;
 
 	while(skb != (struct sk_buff *)q) {
 		struct dn_skb_cb *cb = DN_SKB_CB(skb);
···
 		if (sk->sk_err)
 			goto out;
 
-		if (skb_queue_len(&scp->other_receive_queue)) {
+		if (!skb_queue_empty(&scp->other_receive_queue)) {
 			if (!(flags & MSG_OOB)) {
 				msg->msg_flags |= MSG_OOB;
 				if (!scp->other_report) {

net/decnet/dn_nsp_out.c

···
 
 	dn_nsp_output(sk);
 
-	if (skb_queue_len(&scp->data_xmit_queue) || skb_queue_len(&scp->other_xmit_queue))
+	if (!skb_queue_empty(&scp->data_xmit_queue) ||
+	    !skb_queue_empty(&scp->other_xmit_queue))
 		scp->persist = dn_nsp_persist(sk);
 
 	return 0;

net/ipv4/tcp.c

···
 	struct sk_buff *skb;
 	struct tcp_sock *tp = tcp_sk(sk);
 
-	NET_ADD_STATS_USER(LINUX_MIB_TCPPREQUEUED, skb_queue_len(&tp->ucopy.prequeue));
+	NET_INC_STATS_USER(LINUX_MIB_TCPPREQUEUED);
 
 	/* RX process wants to run with disabled BHs, though it is not
 	 * necessary */
···
 			 * is not empty. It is more elegant, but eats cycles,
 			 * unfortunately.
 			 */
-			if (skb_queue_len(&tp->ucopy.prequeue))
+			if (!skb_queue_empty(&tp->ucopy.prequeue))
 				goto do_prequeue;
 
 			/* __ Set realtime policy in scheduler __ */
···
 			}
 
 			if (tp->rcv_nxt == tp->copied_seq &&
-			    skb_queue_len(&tp->ucopy.prequeue)) {
+			    !skb_queue_empty(&tp->ucopy.prequeue)) {
 do_prequeue:
 				tcp_prequeue_process(sk);
 
···
 	} while (len > 0);
 
 	if (user_recv) {
-		if (skb_queue_len(&tp->ucopy.prequeue)) {
+		if (!skb_queue_empty(&tp->ucopy.prequeue)) {
 			int chunk;
 
 			tp->ucopy.len = copied > 0 ? len : 0;

net/ipv4/tcp_input.c

···
 	int this_sack;
 
 	/* Empty ofo queue, hence, all the SACKs are eaten. Clear. */
-	if (skb_queue_len(&tp->out_of_order_queue) == 0) {
+	if (skb_queue_empty(&tp->out_of_order_queue)) {
 		tp->rx_opt.num_sacks = 0;
 		tp->rx_opt.eff_sacks = tp->rx_opt.dsack;
 		return;
···
 		if(th->fin)
 			tcp_fin(skb, sk, th);
 
-		if (skb_queue_len(&tp->out_of_order_queue)) {
+		if (!skb_queue_empty(&tp->out_of_order_queue)) {
 			tcp_ofo_queue(sk);
 
 			/* RFC2581. 4.2. SHOULD send immediate ACK, when
 			 * gap in queue is filled.
 			 */
-			if (!skb_queue_len(&tp->out_of_order_queue))
+			if (skb_queue_empty(&tp->out_of_order_queue))
 				tp->ack.pingpong = 0;
 		}
 
···
 	 * This must not ever occur. */
 
 	/* First, purge the out_of_order queue. */
-	if (skb_queue_len(&tp->out_of_order_queue)) {
-		NET_ADD_STATS_BH(LINUX_MIB_OFOPRUNED, 
-				 skb_queue_len(&tp->out_of_order_queue));
+	if (!skb_queue_empty(&tp->out_of_order_queue)) {
+		NET_INC_STATS_BH(LINUX_MIB_OFOPRUNED);
 		__skb_queue_purge(&tp->out_of_order_queue);
 
 		/* Reset SACK state.  A conforming SACK implementation will

net/ipv4/tcp_timer.c

···
 	}
 	tp->ack.pending &= ~TCP_ACK_TIMER;
 
-	if (skb_queue_len(&tp->ucopy.prequeue)) {
+	if (!skb_queue_empty(&tp->ucopy.prequeue)) {
 		struct sk_buff *skb;
 
-		NET_ADD_STATS_BH(LINUX_MIB_TCPSCHEDULERFAILED, 
-				 skb_queue_len(&tp->ucopy.prequeue));
+		NET_INC_STATS_BH(LINUX_MIB_TCPSCHEDULERFAILED);
 
 		while ((skb = __skb_dequeue(&tp->ucopy.prequeue)) != NULL)
 			sk->sk_backlog_rcv(sk, skb);

net/irda/irlap.c

···
 	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
 
 	/* Don't disconnect until all data frames are successfully sent */
-	if (skb_queue_len(&self->txq) > 0) {
+	if (!skb_queue_empty(&self->txq)) {
 		self->disconnect_pending = TRUE;
-
 		return;
 	}
 

net/irda/irlap_event.c

···
 	 * Send out the RR frames faster if our own transmit queue is empty, or
 	 * if the peer is busy. The effect is a much faster conversation
 	 */
-	if ((skb_queue_len(&self->txq) == 0) || (self->remote_busy)) {
+	if (skb_queue_empty(&self->txq) || self->remote_busy) {
 		if (self->fast_RR == TRUE) {
 			/*
 			 *  Assert that the fast poll timer has not reached the
···
 		IRDA_DEBUG(2, "%s() : queue len = %d\n", __FUNCTION__,
 			   skb_queue_len(&self->txq));
 
-		if (skb_queue_len(&self->txq)) {
+		if (!skb_queue_empty(&self->txq)) {
 			/* Prevent race conditions with irlap_data_request() */
 			self->local_busy = TRUE;
 
···
 #else	/* CONFIG_IRDA_DYNAMIC_WINDOW */
 			/* Window has been adjusted for the max packet
 			 * size, so much simpler... - Jean II */
-			nextfit = (skb_queue_len(&self->txq) > 0);
+			nextfit = !skb_queue_empty(&self->txq);
 #endif	/* CONFIG_IRDA_DYNAMIC_WINDOW */
 			/*
 			 *  Send data with poll bit cleared only if window > 1
···
 #else	/* CONFIG_IRDA_DYNAMIC_WINDOW */
 			/* Window has been adjusted for the max packet
 			 * size, so much simpler... - Jean II */
-			nextfit = (skb_queue_len(&self->txq) > 0);
+			nextfit = !skb_queue_empty(&self->txq);
 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
 			/*
 			 *  Send data with final bit cleared only if window > 1
···
 				irlap_data_indication(self, skb, FALSE);
 
 				/* Any pending data requests?  */
-				if ((skb_queue_len(&self->txq) > 0) &&
+				if (!skb_queue_empty(&self->txq) &&
 				    (self->window > 0))
 				{
 					self->ack_required = TRUE;
···
 			/*
 			 *  Any pending data requests?
 			 */
-			if ((skb_queue_len(&self->txq) > 0) &&
+			if (!skb_queue_empty(&self->txq) &&
 			    (self->window > 0) && !self->remote_busy)
 			{
 				irlap_data_indication(self, skb, TRUE);
···
 		 */
 		nr_status = irlap_validate_nr_received(self, info->nr);
 		if (nr_status == NR_EXPECTED) {
-			if ((skb_queue_len( &self->txq) > 0) &&
+			if (!skb_queue_empty(&self->txq) &&
 			    (self->window > 0)) {
 				self->remote_busy = FALSE;
 

net/irda/irlap_frame.c

···
 	/*
 	 *  We can now fill the window with additional data frames
 	 */
-	while (skb_queue_len( &self->txq) > 0) {
+	while (!skb_queue_empty(&self->txq)) {
 
 		IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__);
-		if ((skb_queue_len( &self->txq) > 0) &&
-		    (self->window > 0)) {
+		if (self->window > 0) {
 			skb = skb_dequeue( &self->txq);
 			IRDA_ASSERT(skb != NULL, return;);
 
···
 			 *  bit cleared
 			 */
 			if ((self->window > 1) &&
-			    skb_queue_len(&self->txq) > 0)
-			{
+			    !skb_queue_empty(&self->txq)) {
 				irlap_send_data_primary(self, skb);
 			} else {
 				irlap_send_data_primary_poll(self, skb);

net/irda/irttp.c

···
 	/*
 	 *  Check if there is still data segments in the transmit queue
 	 */
-	if (skb_queue_len(&self->tx_queue) > 0) {
+	if (!skb_queue_empty(&self->tx_queue)) {
 		if (priority == P_HIGH) {
 			/*
 			 *  No need to send the queued data, if we are

net/llc/llc_c_ev.c

···
 	if (llc->dev->flags & IFF_LOOPBACK)
 		goto out;
 	rc = 1;
-	if (!skb_queue_len(&llc->pdu_unack_q))
+	if (skb_queue_empty(&llc->pdu_unack_q))
 		goto out;
 	skb = skb_peek(&llc->pdu_unack_q);
 	pdu = llc_pdu_sn_hdr(skb);

net/netlink/af_netlink.c

···
 {
 	struct netlink_sock *nlk = nlk_sk(sk);
 
-	if (!skb_queue_len(&sk->sk_receive_queue))
+	if (skb_queue_empty(&sk->sk_receive_queue))
 		clear_bit(0, &nlk->state);
 	if (!test_bit(0, &nlk->state))
 		wake_up_interruptible(&nlk->wait);

net/sched/sch_red.c

···
 	memcpy(q->Stab, RTA_DATA(tb[TCA_RED_STAB-1]), 256);
 
 	q->qcount = -1;
-	if (skb_queue_len(&sch->q) == 0)
+	if (skb_queue_empty(&sch->q))
 		PSCHED_SET_PASTPERFECT(q->qidlestart);
 	sch_tree_unlock(sch);
 	return 0;

net/unix/af_unix.c

···
  * may receive messages only from that peer. */
 static void unix_dgram_disconnected(struct sock *sk, struct sock *other)
 {
-	if (skb_queue_len(&sk->sk_receive_queue)) {
+	if (!skb_queue_empty(&sk->sk_receive_queue)) {
 		skb_queue_purge(&sk->sk_receive_queue);
 		wake_up_interruptible_all(&unix_sk(sk)->peer_wait);
 
···
 	for (;;) {
 		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 
-		if (skb_queue_len(&sk->sk_receive_queue) ||
+		if (!skb_queue_empty(&sk->sk_receive_queue) ||
 		    sk->sk_err ||
 		    (sk->sk_shutdown & RCV_SHUTDOWN) ||
 		    signal_pending(current) ||