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>

4 files changed, 25 insertions, 28 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_qp.c b/drivers/infiniband/hw/ipath/ipath_qp.c
index b26146c1658..0924a21fec1 100644
--- a/drivers/infiniband/hw/ipath/ipath_qp.c
+++ b/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);
diff --git a/drivers/infiniband/hw/ipath/ipath_rc.c b/drivers/infiniband/hw/ipath/ipath_rc.c
index a4055ca0061..493b1821a93 100644
--- a/drivers/infiniband/hw/ipath/ipath_rc.c
+++ b/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);
diff --git a/drivers/infiniband/hw/ipath/ipath_ruc.c b/drivers/infiniband/hw/ipath/ipath_ruc.c
index eb81424b3c5..d38f4f3cfd1 100644
--- a/drivers/infiniband/hw/ipath/ipath_ruc.c
+++ b/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);
         /*
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index cb9e387c301..3adb86fc8be 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/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);