Re: [PATCH] HID: wacom: Remove raport header check.

[Ping Cheng <pinglinux@xxxxxxxxx>]

On Mon, May 14, 2012 at 9:13 AM, Przemo Firszt <przemo@xxxxxxxxx> wrote:
> That check was valid when hid-wacom was only supporting Wacom Graphire, as the
> device raports always start with 0x03. Intuos4 WL high-speed raports
> begin with 0x04, so the check would be filtering out valid reports.

I assume the if-statement was added on purpose. It was most likely
used to filter noises for Graphire.

Should we change to

if (data[0] != 0x03 || (data[0] != 0x04 &&
    hdev->product == USB_DEVICE_ID_WACOM_INTUOS4_BLUETOOTH)) {

        hid_err(hdev, "Unknown report: %d,%d size:%d\n",
					data[0], data[1], size);
        return 0;
}

and remove default case for I4?

Or, remove the if-statement as you suggested and add a default case
for Graphire to post hid_err and exit when data[0] != 3.

Either way works for me.

Ping

>
> Signed-off-by: Przemo Firszt <przemo@xxxxxxxxx>
> ---
>  drivers/hid/hid-wacom.c |    4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
> index 29372ed..324ea74 100644
> --- a/drivers/hid/hid-wacom.c
> +++ b/drivers/hid/hid-wacom.c
> @@ -578,10 +578,6 @@ static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
>        hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
>        input = hidinput->input;
>
> -       /* Check if this is a tablet report */
> -       if (data[0] != 0x03)
> -               return 0;
> -
>        switch (hdev->product) {
>        case USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH:
>                return wacom_gr_parse_report(hdev, wdata, input, data);
> --
> 1.7.10.1
>
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