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Subject[PATCH v3 05/16] ntb: ntb_test: ensure the link is up before trying to configure the mws
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 <>
tools/testing/selftests/ntb/ | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/tools/testing/selftests/ntb/ b/tools/testing/selftests/ntb/
index 1c12b5855e4f..5fc7ad359e21 100755
--- a/tools/testing/selftests/ntb/
+++ b/tools/testing/selftests/ntb/
@@ -333,6 +333,10 @@ function ntb_tool_tests()

+ #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
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