linux-kernel - [PATCH 5.17 0629/1126] Bluetooth: hci_sync: fix undefined return of hci_disconnect_all

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Message-Id: <20220405070426.099142773@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:22:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tom Rix <trix@...hat.com>,
        Luiz Augusto von Dentz <luiz.von.dentz@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 0629/1126] Bluetooth: hci_sync: fix undefined return of hci_disconnect_all_sync()

From: Tom Rix <trix@...hat.com>

[ Upstream commit 8cd3c55c629efd91e5f2b3e89d850575c5b90d47 ]

clang static analysis reports this problem
hci_sync.c:4428:2: warning: Undefined or garbage value
  returned to caller
        return err;
        ^~~~~~~~~~

If there are no connections this function is a noop but
err is never set and a false error could be reported.
Return 0 as other hci_* functions do.

Fixes: 182ee45da083 ("Bluetooth: hci_sync: Rework hci_suspend_notifier")
Signed-off-by: Tom Rix <trix@...hat.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bluetooth/hci_sync.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 5e93f37c2e04..405d48c3e63e 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -4432,7 +4432,7 @@ static int hci_disconnect_all_sync(struct hci_dev *hdev, u8 reason)
 			return err;
 	}
 
-	return err;
+	return 0;
 }
 
 /* This function perform power off HCI command sequence as follows:
-- 
2.34.1