iw_cxgb4: handle draining an idle qp

In c4iw_drain_sq/rq(), if the particular queue is already empty
then don't block.

Fixes: ce4af14d94aa ('iw_cxgb4: add queue drain functions')
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index e17fb5d..8aa2e52 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -1895,13 +1895,27 @@ int c4iw_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 void c4iw_drain_sq(struct ib_qp *ibqp)
 {
        struct c4iw_qp *qp = to_c4iw_qp(ibqp);
+       unsigned long flag;
+       bool need_to_wait;
+
+       spin_lock_irqsave(&qp->lock, flag);
+       need_to_wait = !t4_sq_empty(&qp->wq);
+       spin_unlock_irqrestore(&qp->lock, flag);
 
-       wait_for_completion(&qp->sq_drained);
+       if (need_to_wait)
+               wait_for_completion(&qp->sq_drained);
 }
 
 void c4iw_drain_rq(struct ib_qp *ibqp)
 {
        struct c4iw_qp *qp = to_c4iw_qp(ibqp);
+       unsigned long flag;
+       bool need_to_wait;
+
+       spin_lock_irqsave(&qp->lock, flag);
+       need_to_wait = !t4_rq_empty(&qp->wq);
+       spin_unlock_irqrestore(&qp->lock, flag);
 
-       wait_for_completion(&qp->rq_drained);
+       if (need_to_wait)
+               wait_for_completion(&qp->rq_drained);
 }