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Subject[PATCH 5.7 467/477] sample-trace-array: Remove trace_array sample-instance
Date
From: Kefeng Wang <wangkefeng.wang@huawei.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@vger.kernel.org
Fixes: 89ed42495ef4a ("tracing: Sample module to demonstrate kernel access to Ftrace instances.")
Reviewed-by: Divya Indi <divya.indi@oracle.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;
}


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