linux-kernel - Re: [PATCH resend 2/2] usb: serial: xsens_mt: always bind to interface number 1

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Message-ID: <CAH6sp9Me6wVTnNGn9Z4pLDsFyTz27EgcEvedF8PrcH-fw+awBQ@mail.gmail.com>
Date:	Thu, 4 Sep 2014 09:12:05 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Frans Klaver <frans.klaver@...ns.com>
Cc:	Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH resend 2/2] usb: serial: xsens_mt: always bind to
 interface number 1

Johan,

I noticed I submitted an error here. Will resend later today.

On Mon, Sep 1, 2014 at 11:39 AM, Frans Klaver <frans.klaver@...ns.com> wrote:
> Probe is testing if the current interface provides two bulk endpoints.
> While this achieves the goal of only binding to the correct interface,
> we already know we can find the device on interface number 1. Stop
> checking the endpoints and just return successfully when interface
> number 1 is probed.
>
> Signed-off-by: Frans Klaver <frans.klaver@...ns.com>
> ---
>  drivers/usb/serial/xsens_mt.c | 23 ++++-------------------
>  1 file changed, 4 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/usb/serial/xsens_mt.c b/drivers/usb/serial/xsens_mt.c
> index d500ccd..ea67ed9 100644
> --- a/drivers/usb/serial/xsens_mt.c
> +++ b/drivers/usb/serial/xsens_mt.c
> @@ -41,28 +41,13 @@ static const struct usb_device_id id_table[] = {
>  };
>  MODULE_DEVICE_TABLE(usb, id_table);
>
> -static int has_required_endpoints(const struct usb_host_interface *interface)
> -{
> -       __u8 i;
> -       int has_bulk_in = 0;
> -       int has_bulk_out = 0;
> -
> -       for (i = 0; i < interface->desc.bNumEndpoints; ++i) {
> -               if (usb_endpoint_is_bulk_in(&interface->endpoint[i].desc))
> -                       has_bulk_in = 1;
> -               else if (usb_endpoint_is_bulk_out(&interface->endpoint[i].desc))
> -                       has_bulk_out = 1;
> -       }
> -
> -       return has_bulk_in && has_bulk_out;
> -}
> -
>  static int xsens_mt_probe(struct usb_serial *serial,
>                                         const struct usb_device_id *id)
>  {
> -       if (!has_required_endpoints(serial->interface->cur_altsetting))
> -               return -ENODEV;
> -       return 0;
> +       if (serial->interface->cur_altsetting.desc.bInterfaceNumber == 1)

This should be

if (serial->interface->cur_altsetting->desc.bInterfaceNumber == 1)


> +               return 0;
> +
> +       return -ENODEV;
>  }
>
>  static struct usb_serial_driver xsens_mt_device = {
> --
> 2.1.0
>
--
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