linux-kernel - [PATCH v0 06/42] firmware: Check notifier registration return value

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Date:   Mon,  8 Nov 2021 11:11:21 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v0 06/42] firmware: 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-arm-kernel@...ts.infradead.org
---
 drivers/firmware/arm_scmi/notify.c | 3 ++-
 drivers/firmware/google/gsmi.c     | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c
index 0efd20cd9d69..f4c42ac00c63 100644
--- a/drivers/firmware/arm_scmi/notify.c
+++ b/drivers/firmware/arm_scmi/notify.c
@@ -1358,7 +1358,8 @@ static int scmi_notifier_register(const struct scmi_handle *handle,
 	if (!hndl)
 		return -EINVAL;
 
-	blocking_notifier_chain_register(&hndl->chain, nb);
+	if (blocking_notifier_chain_register(&hndl->chain, nb))
+		pr_warn("SCMI notifier already registered\n");
 
 	/* Enable events for not pending handlers */
 	if (!IS_HNDL_PENDING(hndl)) {
diff --git a/drivers/firmware/google/gsmi.c b/drivers/firmware/google/gsmi.c
index adaa492c3d2d..a658e7c106c3 100644
--- a/drivers/firmware/google/gsmi.c
+++ b/drivers/firmware/google/gsmi.c
@@ -1030,8 +1030,10 @@ static __init int gsmi_init(void)
 
 	register_reboot_notifier(&gsmi_reboot_notifier);
 	register_die_notifier(&gsmi_die_notifier);
-	atomic_notifier_chain_register(&panic_notifier_list,
-				       &gsmi_panic_notifier);
+
+	if (atomic_notifier_chain_register(&panic_notifier_list,
+					   &gsmi_panic_notifier))
+		pr_warn("gsmi panic notifier already registered\n");
 
 	printk(KERN_INFO "gsmi version " DRIVER_VERSION " loaded\n");
 
-- 
2.29.2