linux-kernel - [PATCH 07/16] ntb: ntb_test: ensure the link is up before trying to configure the mws

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Date:   Wed, 28 Jun 2017 21:26:39 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-ntb@...glegroups.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <Allen.Hubbe@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Stephen Bates <sbates@...thlin.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH 07/16] 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 <logang@...tatee.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