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

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Message-ID: <CAD=FV=VZYOV-uNwPB3zBpfdWV6U0qFeC1HTqwEWR1+x962J3mA@mail.gmail.com>
Date:   Thu, 27 Feb 2020 14:07:14 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Guenter Roeck <linux@...ck-us.net>
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

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).

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