[PATCH] Bluetooth: Fix unnecessary error message for HCI request completion

[PATCH] Bluetooth: Fix unnecessary error message for HCI request completion

[Johan Hedberg]

From: Johan Hedberg <johan.hedberg@intel.com>

In case a command which completes in Command Status was sent using the
hci_cmd_send-family of APIs there would be a misleading error in the
hci_get_cmd_complete function, since the code would be trying to fetch
the Command Complete parameters when there are none.

Avoid the misleading error and silently bail out from the function in
case the received event is a command status.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
---
 net/bluetooth/hci_event.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index ef9928d7b4fb..ac2826ce162b 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -5711,6 +5711,12 @@ static bool hci_get_cmd_complete(struct hci_dev *hdev, u16 opcode,
 		return true;
 	}
 
+	/* Check if request ended in Command Status - no way to retreive
+	 * any extra parameters in this case.
+	 */
+	if (hdr->evt == HCI_EV_CMD_STATUS)
+		return false;
+
 	if (hdr->evt != HCI_EV_CMD_COMPLETE) {
 		bt_dev_err(hdev, "last event is not cmd complete (0x%2.2x)",
 			   hdr->evt);
-- 
2.17.2

Re: [PATCH] Bluetooth: Fix unnecessary error message for HCI request completion

[Luiz Augusto von Dentz]

Hi Johan,
On Tue, Nov 27, 2018 at 11:39 AM Johan Hedberg <johan.hedberg@gmail.com> wrote:
>
> From: Johan Hedberg <johan.hedberg@intel.com>
>
> In case a command which completes in Command Status was sent using the
> hci_cmd_send-family of APIs there would be a misleading error in the
> hci_get_cmd_complete function, since the code would be trying to fetch
> the Command Complete parameters when there are none.
>
> Avoid the misleading error and silently bail out from the function in
> case the received event is a command status.
>
> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
> ---
>  net/bluetooth/hci_event.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index ef9928d7b4fb..ac2826ce162b 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -5711,6 +5711,12 @@ static bool hci_get_cmd_complete(struct hci_dev *hdev, u16 opcode,
>                 return true;
>         }
>
> +       /* Check if request ended in Command Status - no way to retreive
> +        * any extra parameters in this case.
> +        */
> +       if (hdr->evt == HCI_EV_CMD_STATUS)
> +               return false;
> +
>         if (hdr->evt != HCI_EV_CMD_COMPLETE) {
>                 bt_dev_err(hdev, "last event is not cmd complete (0x%2.2x)",
>                            hdr->evt);
> --
> 2.17.2

Ack.


-- 
Luiz Augusto von Dentz

Re: [PATCH] Bluetooth: Fix unnecessary error message for HCI request completion

[Marcel Holtmann]

Hi Johan,

> In case a command which completes in Command Status was sent using the
> hci_cmd_send-family of APIs there would be a misleading error in the
> hci_get_cmd_complete function, since the code would be trying to fetch
> the Command Complete parameters when there are none.
> 
> Avoid the misleading error and silently bail out from the function in
> case the received event is a command status.
> 
> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
> ---
> net/bluetooth/hci_event.c | 6 ++++++
> 1 file changed, 6 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel