[PATCH] usb: xhci-mtk: fix the failure of bandwidth allocation

[Nicolas Boichat]

On Fri, Jul 10, 2020 at 10:30 AM Chunfeng Yun <chunfeng.yun at mediatek.com> wrote:
>
> The wMaxPacketSize field of endpoint descriptor may be zero
> as default value in alternate interface, and they are not
> actually selected when start stream, so skip them when try to
> allocate bandwidth.
>
> Cc: stable <stable at vger.kernel.org>
> Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>

Add this?
Fixes: 0cbd4b34cda9dfd ("xhci: mediatek: support MTK xHCI host controller")

> ---
>  drivers/usb/host/xhci-mtk-sch.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
> index fea5555..45c54d56 100644
> --- a/drivers/usb/host/xhci-mtk-sch.c
> +++ b/drivers/usb/host/xhci-mtk-sch.c
> @@ -557,6 +557,10 @@ static bool need_bw_sch(struct usb_host_endpoint *ep,
>         if (is_fs_or_ls(speed) && !has_tt)
>                 return false;
>
> +       /* skip endpoint with zero maxpkt */
> +       if (usb_endpoint_maxp(&ep->desc) == 0)
> +               return false;
> +
>         return true;
>  }
>
> --
> 1.9.1
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