linux-kernel - [PATCH v0 34/42] powerpc: Check notifier registration return value

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Date:   Mon,  8 Nov 2021 11:11:49 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v0 34/42] powerpc: 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: linuxppc-dev@...ts.ozlabs.org
---
 arch/powerpc/kernel/setup-common.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index b1e43b69a559..32f9900cd4f4 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -725,14 +725,18 @@ static struct notifier_block kernel_offset_notifier = {
 
 void __init setup_panic(void)
 {
-	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
-		atomic_notifier_chain_register(&panic_notifier_list,
-					       &kernel_offset_notifier);
+	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) {
+		if (atomic_notifier_chain_register(&panic_notifier_list,
+						   &kernel_offset_notifier))
+			pr_warn("Kernel offset notifier already registered\n");
+	}
 
 	/* PPC64 always does a hard irq disable in its panic handler */
 	if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
 		return;
-	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
+
+	if (atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block))
+		pr_warn("Panic notifier already registered\n");
 }
 
 #ifdef CONFIG_CHECK_CACHE_COHERENCY
-- 
2.29.2