linux-kernel - [PATCH v0 08/42] Drivers: hv: vmbus: Check notifier registration return value

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Date:   Mon,  8 Nov 2021 11:11:23 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     linux-hyperv@...r.kernel.org
Subject: [PATCH v0 08/42] Drivers: hv: vmbus: 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: linux-hyperv@...r.kernel.org
---
 drivers/hv/vmbus_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 392c1ac4f819..370afd108d2d 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1574,8 +1574,8 @@ static int vmbus_bus_init(void)
 	 * the VMbus channel connection to prevent any VMbus
 	 * activity after the VM panics.
 	 */
-	atomic_notifier_chain_register(&panic_notifier_list,
-			       &hyperv_panic_block);
+	if (atomic_notifier_chain_register(&panic_notifier_list, &hyperv_panic_block))
+		pr_warn("VMBus panic notifier already registered\n");
 
 	vmbus_request_offers();
 
-- 
2.29.2