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    Subject[PATCH 3.16.y-ckt 041/180] usb: serial: silence all non-critical read errors
    Date
    3.16.7-ckt11 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jeremiah Mahler <jmmahler@gmail.com>

    commit aa8e22128b40590b291cd13512098bf258a7e6c5 upstream.

    If a USB serial device is unplugged while there is an active program
    using the device it may spam the logs with -EPROTO (71) messages as it
    attempts to retry.

    Most serial usb drivers (metro-usb, pl2303, mos7840, ...) only output
    these messages for debugging. The generic driver treats these as
    errors.

    Change the default output for the generic serial driver from error to
    debug to silence these non-critical errors.

    Signed-off-by: Jeremiah Mahler <jmmahler@gmail.com>
    Signed-off-by: Johan Hovold <johan@kernel.org>
    Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/usb/serial/generic.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
    index 904ab353ecf2..c44b911937e8 100644
    --- a/drivers/usb/serial/generic.c
    +++ b/drivers/usb/serial/generic.c
    @@ -374,7 +374,7 @@ void usb_serial_generic_read_bulk_callback(struct urb *urb)
    __func__, urb->status);
    return;
    default:
    - dev_err(&port->dev, "%s - nonzero urb status: %d\n",
    + dev_dbg(&port->dev, "%s - nonzero urb status: %d\n",
    __func__, urb->status);
    goto resubmit;
    }

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