linux-kernel - [PATCH v0 02/42] xen/x86: Check notifier registration return value

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Message-Id: <20211108101157.15189-3-bp@alien8.de>
Date:   Mon,  8 Nov 2021 11:11:17 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     xen-devel@...ts.xenproject.org
Subject: [PATCH v0 02/42] xen/x86: 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: xen-devel@...ts.xenproject.org
---
 arch/x86/xen/enlighten.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 95d970359e17..2264dd6e157f 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -354,7 +354,9 @@ static struct notifier_block xen_panic_block = {
 
 int xen_panic_handler_init(void)
 {
-	atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block);
+	if (atomic_notifier_chain_register(&panic_notifier_list, &xen_panic_block))
+		pr_warn("Xen panic notifier already registered\n");
+
 	return 0;
 }
 
-- 
2.29.2