[PATCH 1/2] RPING: Make sure CQ event thread exits before destroying the CQ.

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

It is possible for the CQ event thread to poll the CQ after it has been
destroyed which can result in a seg fault on T3 interfaces.  This patch
cancels the thread and waits for it to exit before destroying the CQ.

Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
---

 examples/rping.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/examples/rping.c b/examples/rping.c
index 91952e7..e603d3b 100644
--- a/examples/rping.c
+++ b/examples/rping.c
@@ -800,10 +800,10 @@ static void *rping_persistent_server_thread(void *arg)
 
 	rping_test_server(cb);
 	rdma_disconnect(cb->child_cm_id);
-	rping_free_buffers(cb);
-	rping_free_qp(cb);
 	pthread_cancel(cb->cqthread);
 	pthread_join(cb->cqthread, NULL);
+	rping_free_buffers(cb);
+	rping_free_qp(cb);
 	rdma_destroy_id(cb->child_cm_id);
 	free_cb(cb);
 	return NULL;
@@ -888,6 +888,8 @@ static int rping_run_server(struct rping_cb *cb)
 
 	rping_test_server(cb);
 	rdma_disconnect(cb->child_cm_id);
+	pthread_cancel(cb->cqthread);
+	pthread_join(cb->cqthread, NULL);
 	rdma_destroy_id(cb->child_cm_id);
 err2:
 	rping_free_buffers(cb);
@@ -1055,6 +1057,8 @@ static int rping_run_client(struct rping_cb *cb)
 
 	rping_test_client(cb);
 	rdma_disconnect(cb->cm_id);
+	pthread_cancel(cb->cqthread);
+	pthread_join(cb->cqthread, NULL);
 err2:
 	rping_free_buffers(cb);
 err1:

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