linux-kernel - [PATCH v0 16/42] USB: Check notifier registration return value

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Message-Id: <20211108101157.15189-17-bp@alien8.de>
Date:   Mon,  8 Nov 2021 11:11:31 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     linux-usb@...r.kernel.org
Subject: [PATCH v0 16/42] USB: 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-usb@...r.kernel.org
---
 drivers/usb/core/notify.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/notify.c b/drivers/usb/core/notify.c
index e6143663778f..80d1bfa61887 100644
--- a/drivers/usb/core/notify.c
+++ b/drivers/usb/core/notify.c
@@ -28,7 +28,8 @@ static BLOCKING_NOTIFIER_HEAD(usb_notifier_list);
  */
 void usb_register_notify(struct notifier_block *nb)
 {
-	blocking_notifier_chain_register(&usb_notifier_list, nb);
+	if (blocking_notifier_chain_register(&usb_notifier_list, nb))
+		pr_warn("USB change notifier already registered\n");
 }
 EXPORT_SYMBOL_GPL(usb_register_notify);
 
-- 
2.29.2