[LTP] [PATCH] try two methods to disable set_ftrace_pid

[Han Pingtian <phan@redhat.com>]

On older kernel, we should use "echo -1 > ..." to disable
set_ftrace_pid, but on the latest kernel we must use
"echo > ..." to disable it. So we have to try both methods
for disabling it in ftrace stress test.

Signed-off-by: Han Pingtian <phan@redhat.com>
---
 .../ftrace_stress/ftrace_set_ftrace_pid.sh         |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/testcases/kernel/tracing/ftrace_stress_test/ftrace_stress/ftrace_set_ftrace_pid.sh b/testcases/kernel/tracing/ftrace_stress_test/ftrace_stress/ftrace_set_ftrace_pid.sh
index 541215c..2ab6cf2 100755
--- a/testcases/kernel/tracing/ftrace_stress_test/ftrace_stress/ftrace_set_ftrace_pid.sh
+++ b/testcases/kernel/tracing/ftrace_stress_test/ftrace_stress/ftrace_set_ftrace_pid.sh
@@ -36,7 +36,13 @@ for ((; ; ))
 			eval echo $str >> "$TRACING_PATH"/set_ftrace_pid
 		}
 
-		echo > "$TRACING_PATH"/set_ftrace_pid
+		if ! echo > "$TRACING_PATH"/set_ftrace_pid >/dev/null 2>&1; then
+			echo -1 > "$TRACING_PATH"/set_ftrace_pid >/dev/null 2>&1 
+
+			if [ $? -ne 0 ]; then
+				tst_resm TBROK "Cannot disable set_ftrace_pid!"
+			fi
+		fi
 	}
 
 	sleep 1
-- 
1.7.1

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