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

[Chunfeng Yun]

On Fri, 2020-07-10 at 11:14 +0800, Nicolas Boichat wrote:
> 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")
Ok, thanks

> 
> > ---
> >  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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