[PATCH for-next v13 03/10] RDMA/rxe: Check rxe_get() return value

[Bob Pearson <rpearsonhpe@gmail.com>]

In the tasklets (completer, responder, and requester) check the
return value from rxe_get() to detect failures to get a reference.
This only occurs if the qp has had its reference count drop to
zero which indicates that it no longer should be used. This is
in preparation to an upcoming change that will move the qp cleanup
code to rxe_qp_cleanup().

Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
---
 drivers/infiniband/sw/rxe/rxe_comp.c | 3 ++-
 drivers/infiniband/sw/rxe/rxe_req.c  | 3 ++-
 drivers/infiniband/sw/rxe/rxe_resp.c | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_comp.c b/drivers/infiniband/sw/rxe/rxe_comp.c
index 138b3e7d3a5f..da3a398053b8 100644
--- a/drivers/infiniband/sw/rxe/rxe_comp.c
+++ b/drivers/infiniband/sw/rxe/rxe_comp.c
@@ -562,7 +562,8 @@ int rxe_completer(void *arg)
 	enum comp_state state;
 	int ret = 0;
 
-	rxe_get(qp);
+	if (!rxe_get(qp))
+		return -EAGAIN;
 
 	if (!qp->valid || qp->req.state == QP_STATE_ERROR ||
 	    qp->req.state == QP_STATE_RESET) {
diff --git a/drivers/infiniband/sw/rxe/rxe_req.c b/drivers/infiniband/sw/rxe/rxe_req.c
index ae5fbc79dd5c..27aba921cc66 100644
--- a/drivers/infiniband/sw/rxe/rxe_req.c
+++ b/drivers/infiniband/sw/rxe/rxe_req.c
@@ -611,7 +611,8 @@ int rxe_requester(void *arg)
 	struct rxe_ah *ah;
 	struct rxe_av *av;
 
-	rxe_get(qp);
+	if (!rxe_get(qp))
+		return -EAGAIN;
 
 next_wqe:
 	if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR))
diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
index 16fc7ea1298d..1ed45c192cf5 100644
--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -1250,7 +1250,8 @@ int rxe_responder(void *arg)
 	struct rxe_pkt_info *pkt = NULL;
 	int ret = 0;
 
-	rxe_get(qp);
+	if (!rxe_get(qp))
+		return -EAGAIN;
 
 	qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
 
-- 
2.32.0