linux-kernel - [PATCH -next] tracing: Fix return value check in trace_benchmark

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Date:   Thu, 12 Jan 2017 13:55:02 +0000
From:   Wei Yongjun <weiyj.lk@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Wei Yongjun <weiyongjun1@...wei.com>, linux-kernel@...r.kernel.org
Subject: [PATCH -next] tracing: Fix return value check in trace_benchmark_reg()

From: Wei Yongjun <weiyongjun1@...wei.com>

In case of error, the function kthread_run() returns ERR_PTR() and never
returns NULL. The NULL test in the return value check should be replaced
with IS_ERR().

Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 kernel/trace/trace_benchmark.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_benchmark.c b/kernel/trace/trace_benchmark.c
index e3b4888..e49fbe9 100644
--- a/kernel/trace/trace_benchmark.c
+++ b/kernel/trace/trace_benchmark.c
@@ -175,9 +175,9 @@ int trace_benchmark_reg(void)
 
 	bm_event_thread = kthread_run(benchmark_event_kthread,
 				      NULL, "event_benchmark");
-	if (!bm_event_thread) {
+	if (IS_ERR(bm_event_thread)) {
 		pr_warning("trace benchmark failed to create kernel thread\n");
-		return -ENOMEM;
+		return PTR_ERR(bm_event_thread);
 	}
 
 	return 0;