linux-kernel - Re: [RFT PATCH 2/4] usb: dwc2: Do not update data length if it is 0 on inbound transfers

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Date:   Thu, 27 Feb 2020 16:32:24 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Minas Harutyunyan <hminas@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Antti Seppälä <a.seppala@...il.com>,
        Boris ARZUR <boris@...bu.org>, linux-usb@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Martin Schiller <ms@....tdt.de>
Subject: Re: [RFT PATCH 2/4] usb: dwc2: Do not update data length if it is 0
 on inbound transfers

On Thu, Feb 27, 2020 at 02:06:44PM -0800, Doug Anderson wrote:
> Hi,
> 
> On Wed, Feb 26, 2020 at 1:04 PM Guenter Roeck <linux@...ck-us.net> wrote:
> >
> > The DWC2 documentation states that transfers with zero data length should
> > set the number of packets to 1 and the transfer length to 0. This is not
> > currently the case for inbound transfers: the transfer length is set to
> > the maximum packet length. This can have adverse effects if the chip
> > actually does transfer data as it is programmed to do. Follow chip
> > documentation and keep the transfer length set to 0 in that situation.
> >
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> >  drivers/usb/dwc2/hcd.c | 15 ++++++++-------
> >  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> I don't have any other test setup that you don't have, so just giving
> my review tag and not tested tag.
> 
> I will note that it feels like this should have a "Fixes" tag or a
> direct Cc to stable to make it obvious that it should make its way
> back to stable trees.
> 

I added

Fixes: 56f5b1cff22a1 ("staging: Core files for the DWC2 driver")

> Reviewed-by: Douglas Anderson <dianders@...omium.org>

Thanks!

Guenter