linux-kernel - [for-linus][PATCH 4/5] ftrace: Add cleanup to unregister_ftrace_direct

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Message-ID: <20211209153223.650040623@goodmis.org>
Date:   Thu, 09 Dec 2021 10:29:12 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: [for-linus][PATCH 4/5] ftrace: Add cleanup to unregister_ftrace_direct_multi

From: Jiri Olsa <jolsa@...hat.com>

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

Link: https://lkml.kernel.org/r/20211206182032.87248-3-jolsa@kernel.org

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Fixes: f64dd4627ec6 ("ftrace: Add multi direct register/unregister interface")
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.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);
-- 
2.33.0