linux-kernel - [PATCH 2/3] ftrace: Add cleanup to unregister_ftrace_direct

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Date:   Mon,  6 Dec 2021 19:20:31 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: [PATCH 2/3] ftrace: Add cleanup to unregister_ftrace_direct_multi

Adding ops cleanup to unregister_ftrace_direct_multi,
so it can be reused in another register call.

Fixes: f64dd4627ec6 ("ftrace: Add multi direct register/unregister interface")
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 kernel/trace/ftrace.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 7f0594e28226..be5f6b32a012 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5542,6 +5542,10 @@ int unregister_ftrace_direct_multi(struct ftrace_ops *ops, unsigned long addr)
 	err = unregister_ftrace_function(ops);
 	remove_direct_functions_hash(hash, addr);
 	mutex_unlock(&direct_mutex);
+
+	/* cleanup for possible another register call */
+	ops->func = NULL;
+	ops->trampoline = 0;
 	return err;
 }
 EXPORT_SYMBOL_GPL(unregister_ftrace_direct_multi);
-- 
2.33.1