linux-kernel - [PATCH 5.14 432/432] tracing/osnoise: Fix missed cpus_read_unlock() in start_per_cpu

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Message-Id: <20210916155825.490889167@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 18:03:01 +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,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        "Qiang.Zhang" <qiang.zhang@...driver.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 5.14 432/432] tracing/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()

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

commit 4b6b08f2e45edda4c067ac40833e3c1f84383c0b upstream.

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

Link: https://lkml.kernel.org/r/20210831022919.27630-1-qiang.zhang@windriver.com

Cc: <stable@...r.kernel.org>
Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
Acked-by: Daniel Bristot de Oliveira <bristot@...nel.org>
Signed-off-by: Qiang.Zhang <qiang.zhang@...driver.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/trace/trace_osnoise.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1548,7 +1548,7 @@ static int start_kthread(unsigned int cp
 static int start_per_cpu_kthreads(struct trace_array *tr)
 {
 	struct cpumask *current_mask = &save_cpumask;
-	int retval;
+	int retval = 0;
 	int cpu;
 
 	get_online_cpus();
@@ -1568,13 +1568,13 @@ static int start_per_cpu_kthreads(struct
 		retval = start_kthread(cpu);
 		if (retval) {
 			stop_per_cpu_kthreads();
-			return retval;
+			break;
 		}
 	}
 
 	put_online_cpus();
 
-	return 0;
+	return retval;
 }
 
 #ifdef CONFIG_HOTPLUG_CPU