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

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

drivers/infiniband/hw/cxgb4/qp.c

+16 −2
Original line number Diff line number Diff line
@@ -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);



	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);



	if (need_to_wait)

		wait_for_completion(&qp->rq_drained);

}