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    Subject[PATCH 4.4 32/48] USB: serial: ch341: fix resume after reset
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

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

    From: Johan Hovold <johan@kernel.org>

    commit ce5e292828117d1b71cbd3edf9e9137cf31acd30 upstream.

    Fix reset-resume handling which failed to resubmit the read and
    interrupt URBs, thereby leaving a port that was open before suspend in a
    broken state until closed and reopened.

    Fixes: 1ded7ea47b88 ("USB: ch341 serial: fix port number changed after
    resume")
    Fixes: 2bfd1c96a9fb ("USB: serial: ch341: remove reset_resume callback")
    Signed-off-by: Johan Hovold <johan@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/serial/ch341.c | 17 +++++++++++++----
    1 file changed, 13 insertions(+), 4 deletions(-)

    --- a/drivers/usb/serial/ch341.c
    +++ b/drivers/usb/serial/ch341.c
    @@ -554,14 +554,23 @@ static int ch341_tiocmget(struct tty_str

    static int ch341_reset_resume(struct usb_serial *serial)
    {
    - struct ch341_private *priv;
    -
    - priv = usb_get_serial_port_data(serial->port[0]);
    + struct usb_serial_port *port = serial->port[0];
    + struct ch341_private *priv = usb_get_serial_port_data(port);
    + int ret;

    /* reconfigure ch341 serial port after bus-reset */
    ch341_configure(serial->dev, priv);

    - return 0;
    + if (test_bit(ASYNCB_INITIALIZED, &port->port.flags)) {
    + ret = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
    + if (ret) {
    + dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
    + ret);
    + return ret;
    + }
    + }
    +
    + return usb_serial_generic_resume(serial);
    }

    static struct usb_serial_driver ch341_device = {

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