ftrace: Use guard to take the ftrace_lock in release_probe()

The ftrace_lock is held throughout the entire release_probe() function.
Use guard to simplify any exit paths.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/20241028071308.250787901@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 64997416415ec1ccd1efa8996cfb24f3f77257b3..c0fabd7da5b20a15dad23448e55bafe375698b26 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5288,7 +5288,7 @@ static void release_probe(struct ftrace_func_probe *probe)
 {
        struct ftrace_probe_ops *probe_ops;
 
-       mutex_lock(&ftrace_lock);
+       guard(mutex)(&ftrace_lock);
 
        WARN_ON(probe->ref <= 0);
 
@@ -5306,7 +5306,6 @@ static void release_probe(struct ftrace_func_probe *probe)
                list_del(&probe->list);
                kfree(probe);
        }
-       mutex_unlock(&ftrace_lock);
 }
 
 static void acquire_probe_locked(struct ftrace_func_probe *probe)