linux-kernel - [PATCH v0 21/42] tracing: Check notifier registration return value

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Message-Id: <20211108101157.15189-22-bp@alien8.de>
Date:   Mon,  8 Nov 2021 11:11:36 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH v0 21/42] tracing: Check notifier registration return value

From: Borislav Petkov <bp@...e.de>

Avoid homegrown notifier registration checks.

No functional changes.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f9139dc1262c..87fd6f1fa407 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -10064,8 +10064,8 @@ __init static int tracer_alloc_buffers(void)
 	/* All seems OK, enable tracing */
 	tracing_disabled = 0;
 
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &trace_panic_notifier);
+	if (atomic_notifier_chain_register(&panic_notifier_list, &trace_panic_notifier))
+		pr_warn("Trace panic notifier already registered\n");
 
 	register_die_notifier(&trace_die_notifier);
 
-- 
2.29.2