IB/core: Don't drain non-existent rq queue-pair

The drain_rq function expects a normal receive qp to drain.  A qp can
only have either a normal rq or an srq.  If there is an srq, there
is no rq to drain.  Until the API supports draining SRQs, simply
skip draining the rq when the qp has an srq attached.

Fixes: 765d67748bcf ("IB: new common API for draining queues")
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 15b8adbf39c0f46fcf25726a5eefc6cc24f2d046..b65b3541e7329e9d716dd40fb81189db97ec9700 100644 (file)
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1860,6 +1860,7 @@ EXPORT_SYMBOL(ib_drain_rq);
 void ib_drain_qp(struct ib_qp *qp)
 {
        ib_drain_sq(qp);
-       ib_drain_rq(qp);
+       if (!qp->srq)
+               ib_drain_rq(qp);
 }
 EXPORT_SYMBOL(ib_drain_qp);