IB/ipath: replace uses of LIST_POISON

Per Andrew's request.
Signed-off-by: Bryan O'Sullivan <bos@pathscale.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ipath/ipath_qp.c

@@ -375,10 +375,10 @@ static void ipath_error_qp(struct ipath_qp *qp)
 
 	spin_lock(&dev->pending_lock);
 	/* XXX What if its already removed by the timeout code? */
-	if (qp->timerwait.next != LIST_POISON1)
-		list_del(&qp->timerwait);
-	if (qp->piowait.next != LIST_POISON1)
-		list_del(&qp->piowait);
+	if (!list_empty(&qp->timerwait))
+		list_del_init(&qp->timerwait);
+	if (!list_empty(&qp->piowait))
+		list_del_init(&qp->piowait);
 	spin_unlock(&dev->pending_lock);
 
 	wc.status = IB_WC_WR_FLUSH_ERR;
@@ -712,10 +712,8 @@ struct ib_qp *ipath_create_qp(struct ib_pd *ibpd,
 			     init_attr->qp_type == IB_QPT_RC ?
 			     ipath_do_rc_send : ipath_do_uc_send,
 			     (unsigned long)qp);
-		qp->piowait.next = LIST_POISON1;
-		qp->piowait.prev = LIST_POISON2;
-		qp->timerwait.next = LIST_POISON1;
-		qp->timerwait.prev = LIST_POISON2;
+		INIT_LIST_HEAD(&qp->piowait);
+		INIT_LIST_HEAD(&qp->timerwait);
 		qp->state = IB_QPS_RESET;
 		qp->s_wq = swq;
 		qp->s_size = init_attr->cap.max_send_wr + 1;
@@ -785,10 +783,10 @@ int ipath_destroy_qp(struct ib_qp *ibqp)
 
 	/* Make sure the QP isn't on the timeout list. */
 	spin_lock_irqsave(&dev->pending_lock, flags);
-	if (qp->timerwait.next != LIST_POISON1)
-		list_del(&qp->timerwait);
-	if (qp->piowait.next != LIST_POISON1)
-		list_del(&qp->piowait);
+	if (!list_empty(&qp->timerwait))
+		list_del_init(&qp->timerwait);
+	if (!list_empty(&qp->piowait))
+		list_del_init(&qp->piowait);
 	spin_unlock_irqrestore(&dev->pending_lock, flags);
 
 	/*
@@ -857,10 +855,10 @@ void ipath_sqerror_qp(struct ipath_qp *qp, struct ib_wc *wc)
 
 	spin_lock(&dev->pending_lock);
 	/* XXX What if its already removed by the timeout code? */
-	if (qp->timerwait.next != LIST_POISON1)
-		list_del(&qp->timerwait);
-	if (qp->piowait.next != LIST_POISON1)
-		list_del(&qp->piowait);
+	if (!list_empty(&qp->timerwait))
+		list_del_init(&qp->timerwait);
+	if (!list_empty(&qp->piowait))
+		list_del_init(&qp->piowait);
 	spin_unlock(&dev->pending_lock);
 
 	ipath_cq_enter(to_icq(qp->ibqp.send_cq), wc, 1);

drivers/infiniband/hw/ipath/ipath_rc.c

@@ -57,7 +57,7 @@ static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe)
 	qp->s_len = wqe->length - len;
 	dev = to_idev(qp->ibqp.device);
 	spin_lock(&dev->pending_lock);
-	if (qp->timerwait.next == LIST_POISON1)
+	if (list_empty(&qp->timerwait))
 		list_add_tail(&qp->timerwait,
 			      &dev->pending[dev->pending_index]);
 	spin_unlock(&dev->pending_lock);
@@ -356,7 +356,7 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp,
 		if ((int)(qp->s_psn - qp->s_next_psn) > 0)
 			qp->s_next_psn = qp->s_psn;
 		spin_lock(&dev->pending_lock);
-		if (qp->timerwait.next == LIST_POISON1)
+		if (list_empty(&qp->timerwait))
 			list_add_tail(&qp->timerwait,
 				      &dev->pending[dev->pending_index]);
 		spin_unlock(&dev->pending_lock);
@@ -726,8 +726,8 @@ void ipath_restart_rc(struct ipath_qp *qp, u32 psn, struct ib_wc *wc)
 	 */
 	dev = to_idev(qp->ibqp.device);
 	spin_lock(&dev->pending_lock);
-	if (qp->timerwait.next != LIST_POISON1)
-		list_del(&qp->timerwait);
+	if (!list_empty(&qp->timerwait))
+		list_del_init(&qp->timerwait);
 	spin_unlock(&dev->pending_lock);
 
 	if (wqe->wr.opcode == IB_WR_RDMA_READ)
@@ -886,8 +886,8 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode)
 	 * just won't find anything to restart if we ACK everything.
 	 */
 	spin_lock(&dev->pending_lock);
-	if (qp->timerwait.next != LIST_POISON1)
-		list_del(&qp->timerwait);
+	if (!list_empty(&qp->timerwait))
+		list_del_init(&qp->timerwait);
 	spin_unlock(&dev->pending_lock);
 
 	/*
@@ -1194,8 +1194,7 @@ static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev,
 		     IB_WR_RDMA_READ))
 		goto ack_done;
 	spin_lock(&dev->pending_lock);
-	if (qp->s_rnr_timeout == 0 &&
-	    qp->timerwait.next != LIST_POISON1)
+	if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait))
 		list_move_tail(&qp->timerwait,
 			       &dev->pending[dev->pending_index]);
 	spin_unlock(&dev->pending_lock);

drivers/infiniband/hw/ipath/ipath_ruc.c

@@ -435,7 +435,7 @@ void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev)
 	unsigned long flags;
 
 	spin_lock_irqsave(&dev->pending_lock, flags);
-	if (qp->piowait.next == LIST_POISON1)
+	if (list_empty(&qp->piowait))
 		list_add_tail(&qp->piowait, &dev->piowait);
 	spin_unlock_irqrestore(&dev->pending_lock, flags);
 	/*

drivers/infiniband/hw/ipath/ipath_verbs.c

@@ -464,7 +464,7 @@ static void ipath_ib_timer(void *arg)
 	last = &dev->pending[dev->pending_index];
 	while (!list_empty(last)) {
 		qp = list_entry(last->next, struct ipath_qp, timerwait);
-		list_del(&qp->timerwait);
+		list_del_init(&qp->timerwait);
 		qp->timer_next = resend;
 		resend = qp;
 		atomic_inc(&qp->refcount);
@@ -474,7 +474,7 @@ static void ipath_ib_timer(void *arg)
 		qp = list_entry(last->next, struct ipath_qp, timerwait);
 		if (--qp->s_rnr_timeout == 0) {
 			do {
-				list_del(&qp->timerwait);
+				list_del_init(&qp->timerwait);
 				tasklet_hi_schedule(&qp->s_task);
 				if (list_empty(last))
 					break;
@@ -554,7 +554,7 @@ static int ipath_ib_piobufavail(void *arg)
 	while (!list_empty(&dev->piowait)) {
 		qp = list_entry(dev->piowait.next, struct ipath_qp,
 				piowait);
-		list_del(&qp->piowait);
+		list_del_init(&qp->piowait);
 		tasklet_hi_schedule(&qp->s_task);
 	}
 	spin_unlock_irqrestore(&dev->pending_lock, flags);