linux-kernel - [PATCH 5.7 467/477] sample-trace-array: Remove trace

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Date:   Tue, 23 Jun 2020 21:57:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Divya Indi <divya.indi@...cle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 5.7 467/477] sample-trace-array: Remove trace_array sample-instance

From: Kefeng Wang <wangkefeng.wang@...wei.com>

commit 9fbc01cdba66e988122ccdc6094cfd85d9587769 upstream.

Remove trace_array 'sample-instance' if kthread_run fails
in sample_trace_array_init().

Link: https://lkml.kernel.org/r/20200609135200.2206726-1-wangkefeng.wang@huawei.com

Cc: stable@...r.kernel.org
Fixes: 89ed42495ef4a ("tracing: Sample module to demonstrate kernel access to Ftrace instances.")
Reviewed-by: Divya Indi <divya.indi@...cle.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 samples/ftrace/sample-trace-array.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/samples/ftrace/sample-trace-array.c
+++ b/samples/ftrace/sample-trace-array.c
@@ -107,8 +107,12 @@ static int __init sample_trace_array_ini
 	trace_printk_init_buffers();
 
 	simple_tsk = kthread_run(simple_thread, NULL, "sample-instance");
-	if (IS_ERR(simple_tsk))
+	if (IS_ERR(simple_tsk)) {
+		trace_array_put(tr);
+		trace_array_destroy(tr);
 		return -1;
+	}
+
 	return 0;
 }