linux-kernel - [PATCH] trace/osnoise: fix missed cpus_read

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Message-Id: <20210829055206.137025-1-qiang.zhang@windriver.com>
Date:   Sun, 29 Aug 2021 13:52:06 +0800
From:   qiang.zhang@...driver.com
To:     bristot@...hat.com, rostedt@...dmis.org, bristot@...nel.org,
        mingo@...hat.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] trace/osnoise: fix missed cpus_read_unlock()

From: "Qiang.zhang" <qiang.zhang@...driver.com>

When start_kthread() return error, the cpus_read_unlock() need
to be called.

Signed-off-by: Qiang.zhang <qiang.zhang@...driver.com>
---
 kernel/trace/trace_osnoise.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 65b08b8e5bf8..45d22d6f3acb 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1568,6 +1568,7 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
 		retval = start_kthread(cpu);
 		if (retval) {
 			stop_per_cpu_kthreads();
+			cpus_read_unlock();
 			return retval;
 		}
 	}
-- 
2.25.1