After the link tests, there is a race on one side of the test for
the link coming up. It's possible, in some cases, for the test script
to write to the 'peer_trans' files before the link has come up.

To fix this, we simply use the link event file to ensure both sides
see the link as up before continuning.

Signed-off-by: Logan Gunthorpe <log...@deltatee.com>
---
 tools/testing/selftests/ntb/ntb_test.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/ntb/ntb_test.sh 
b/tools/testing/selftests/ntb/ntb_test.sh
index 1c12b5855e4f..5fc7ad359e21 100755
--- a/tools/testing/selftests/ntb/ntb_test.sh
+++ b/tools/testing/selftests/ntb/ntb_test.sh
@@ -333,6 +333,10 @@ function ntb_tool_tests()
        link_test $LOCAL_TOOL $REMOTE_TOOL
        link_test $REMOTE_TOOL $LOCAL_TOOL
 
+       #Ensure the link is up on both sides before continuing
+       write_file Y $LOCAL_TOOL/link_event
+       write_file Y $REMOTE_TOOL/link_event
+
        for PEER_TRANS in $(ls $LOCAL_TOOL/peer_trans*); do
                PT=$(basename $PEER_TRANS)
                write_file $MW_SIZE $LOCAL_TOOL/$PT
-- 
2.11.0

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