linux-kernel - Re: [PATCH 1/1 v2] Bluetooth: make the balance of judgement condition to fix a false report

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Date:   Mon, 26 Nov 2018 13:23:07 +0200
From:   Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:     zumeng.chen@...il.com
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1 v2] Bluetooth: make the balance of judgement condition
 to fix a false report

Hi Marcel,
On Thu, Nov 15, 2018 at 3:37 AM Zumeng Chen <zumeng.chen@...il.com> wrote:
>
> This patch is to balance the condition scope between hci_get_cmd_complete and
> hci_event_packet about orig_skb as follows:
>
>         if (req_complete_skb || event == HCI_EV_CMD_STATUS ||
>             event == HCI_EV_CMD_COMPLETE)
>                 orig_skb = skb_clone(skb, GFP_KERNEL);
>
> And hci_get_cmd_complete will bt_dev_err out when HCI_EV_CMD_STATUS, so a lot
> of asymmetric conditions are triggered. Since both of them are the entry into
> hci_get_cmd_complete, we'd better get STATUS into judge the false out there.
>
> Signed-off-by: Zumeng Chen <zumeng.chen@...il.com>
> ---
>
> v2: remove redundant braces and adjust the indentation.
>
> Cheers,
> Zumeng
>
>  net/bluetooth/hci_event.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 235b5aa..1d2a8fe 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -5217,7 +5217,8 @@ static bool hci_get_cmd_complete(struct hci_dev *hdev, u16 opcode,
>                 return true;
>         }
>
> -       if (hdr->evt != HCI_EV_CMD_COMPLETE) {
> +       if (!(hdr->evt == HCI_EV_CMD_COMPLETE ||
> +             hdr->evt == HCI_EV_CMD_STATUS)) {
>                 bt_dev_err(hdev, "last event is not cmd complete (0x%2.2x)",
>                            hdr->evt);
>                 return false;
> --
> 2.7.4

It appears we need this also for enabling vendor_diag with intel controllers:

[399314.236288] hci_cmd_status_evt:3138: hci0 opcode 0xfc43
[399314.236291] Bluetooth: hci0: last event is not cmd complete (0x0f)
[399314.236359] Bluetooth: hci0: Changing Intel diagnostic mode failed (-16)


-- 
Luiz Augusto von Dentz