tracing/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()

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@vger.kernel.org>
Fixes: c8895e271f79 ("trace/osnoise: Support hotplug operations")
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Qiang.Zhang <qiang.zhang@windriver.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 65b08b8..ce05361 100644 (file)
--- 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