linux-kernel - Re: [RFT PATCH 4/4] usb: dwc2: Make "trimming xfer length" a debug message

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Date:   Thu, 27 Feb 2020 16:38:59 -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 4/4] usb: dwc2: Make "trimming xfer length" a debug
 message

On Thu, Feb 27, 2020 at 02:07:14PM -0800, Doug Anderson wrote:
> Hi,
> 
> On Wed, Feb 26, 2020 at 1:04 PM Guenter Roeck <linux@...ck-us.net> wrote:
> >
> > With some USB network adapters, such as DM96xx, the following message
> > is seen for each maximum size receive packet.
> >
> > dwc2 ff540000.usb: dwc2_update_urb_state(): trimming xfer length
> >
> > This happens because the packet size requested by the driver is 1522
> > bytes, wMaxPacketSize is 64, the dwc2 driver configures the chip to
> > receive 24*64 = 1536 bytes, and the chip does indeed send more than
> > 1522 bytes of data. Since the event does not indicate an error condition,
> > the message is just noise. Demote it to debug level.
> >
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> >  drivers/usb/dwc2/hcd_intr.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Suggest a "Fixes" or "Cc: stable" tag.  This one isn't as important as
> the others, but presumably you'll start hitting it a lot more now
> (whereas previously we'd just crash).
> 
Good point. Added

Fixes: 7359d482eb4d3 ("staging: HCD files for the DWC2 driver")

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

Thanks again!

Guenter