[v0,02/42] xen/x86: Check notifier registration return value

Commit Message

Borislav Petkov Nov. 8, 2021, 10:11 a.m. UTC

From: Borislav Petkov <[e-mail]>

Avoid homegrown notifier registration checks.

No functional changes.

Signed-off-by: Borislav Petkov <[e-mail]>
Cc: [e-mail]
---
 arch/x86/xen/enlighten.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Patch

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;
 }