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ntb: ntb_test: ensure the link is up before trying to configure the mws

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commit 0eb46345364d7318b11068c46e8a68d5dc10f65e upstream.

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 <logang@deltatee.com>
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Fixes: a9c59ef774 ("ntb_test: Add a selftest script for the NTB subsystem")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Logan Gunthorpe
2017-07-25 14:57:42 -06:00
committed by Greg Kroah-Hartman
parent 7592db5555
commit 4d4f35473d
1 changed files with 4 additions and 0 deletions
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tools/testing/selftests/ntb/ntb_test.sh
+4
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@@ -326,6 +326,10 @@ 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