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

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Message-ID: <CABBYNZJx0Yye2f7ZE7d0WeZ6QQTQGUDHhqeobWZHE3PZGmG72A@mail.gmail.com>
Date:   Tue, 1 Feb 2022 12:24:56 -0800
From:   Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:     trix@...hat.com
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, nathan@...nel.org,
        ndesaulniers@...gle.com,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] Bluetooth: hci_sync: fix undefined return of hci_disconnect_all_sync()

Hi Tom,

On Tue, Feb 1, 2022 at 9:43 AM <trix@...hat.com> wrote:
>
> 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

Applied, thanks.

-- 
Luiz Augusto von Dentz