Commit 40edd7fd authored by Steve Wise's avatar Steve Wise Committed by Doug Ledford

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: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent ad202348
...@@ -1895,13 +1895,27 @@ int c4iw_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, ...@@ -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) void c4iw_drain_sq(struct ib_qp *ibqp)
{ {
struct c4iw_qp *qp = to_c4iw_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) void c4iw_drain_rq(struct ib_qp *ibqp)
{ {
struct c4iw_qp *qp = to_c4iw_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);
} }
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