linux-kernel - [PATCH v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu

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Message-Id: <20210831022919.27630-1-qiang.zhang@windriver.com>
Date:   Tue, 31 Aug 2021 10:29:19 +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 v2] trace/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()

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

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

Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
Cc: <stable@...r.kernel.org> # v5.14+
Signed-off-by: Qiang.Zhang <qiang.zhang@...driver.com>
---
 v1->v2:
 Modify submission information and code style, add tags.

 kernel/trace/trace_osnoise.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 65b08b8e5bf8..ce053619f289 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1548,7 +1548,7 @@ static int start_kthread(unsigned int cpu)
 static int start_per_cpu_kthreads(struct trace_array *tr)
 {
 	struct cpumask *current_mask = &save_cpumask;
-	int retval;
+	int retval = 0;
 	int cpu;
 
 	cpus_read_lock();
@@ -1568,13 +1568,13 @@ static int start_per_cpu_kthreads(struct trace_array *tr)
 		retval = start_kthread(cpu);
 		if (retval) {
 			stop_per_cpu_kthreads();
-			return retval;
+			break;
 		}
 	}
 
 	cpus_read_unlock();
 
-	return 0;
+	return retval;
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
-- 
2.17.1