linux-kernel - [PATCH] Bluetooth: hci_sync: fix undefined return of hci_disconnect_all

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Message-Id: <20220201174256.1690515-1-trix@redhat.com>
Date:   Tue,  1 Feb 2022 09:42:56 -0800
From:   trix@...hat.com
To:     marcel@...tmann.org, johan.hedberg@...il.com, luiz.dentz@...il.com,
        davem@...emloft.net, kuba@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com
Cc:     linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] Bluetooth: hci_sync: fix undefined return of hci_disconnect_all_sync()

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

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>
---
 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 6e71aa6b6feae..9327737da6003 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -4425,7 +4425,7 @@ 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:
-- 
2.26.3