linux-kernel - [PATCH 4.19 110/280] selftests: fib_tests: sleep after changing carrier. again.

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Date:   Fri, 22 Mar 2019 12:14:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Ahern <dsahern@...il.com>,
        Thadeu Lima de Souza Cascardo <cascardo@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 110/280] selftests: fib_tests: sleep after changing carrier. again.

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit af548a27b158d548d41e56255e6eaca1658cc3be ]

Just like commit e2ba732a1681 ("selftests: fib_tests: sleep after
changing carrier"), wait one second to allow linkwatch to propagate the
carrier change to the stack.

There are two sets of carrier tests. The first slept after the carrier
was set to off, and when the second set ran, it was likely that the
linkwatch would be able to run again without much delay, reducing the
likelihood of a race. However, if you run 'fib_tests.sh -t carrier' on a
loop, you will quickly notice the failures.

Sleeping on the second set of tests make the failures go away.

Cc: David Ahern <dsahern@...il.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Reviewed-by: David Ahern <dsahern@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/net/fib_tests.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/net/fib_tests.sh b/tools/testing/selftests/net/fib_tests.sh
index 0f45633bd634..a4ccde0e473b 100755
--- a/tools/testing/selftests/net/fib_tests.sh
+++ b/tools/testing/selftests/net/fib_tests.sh
@@ -385,6 +385,7 @@ fib_carrier_unicast_test()

 	set -e
 	$IP link set dev dummy0 carrier off
+	sleep 1
 	set +e

 	echo "    Carrier down"
-- 
2.19.1