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    Subject[PATCH 4.14 09/27] usb: cdc-acm: send ZLP for Telit 3G Intel based modems
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

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

    From: Daniele Palmas <dnlplm@gmail.com>

    commit 34aabf918717dd14e05051896aaecd3b16b53d95 upstream.

    Telit 3G Intel based modems require zero packet to be sent if
    out data size is equal to the endpoint max packet size.

    Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
    Cc: stable <stable@vger.kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/class/cdc-acm.c | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/drivers/usb/class/cdc-acm.c
    +++ b/drivers/usb/class/cdc-acm.c
    @@ -1893,6 +1893,13 @@ static const struct usb_device_id acm_id
    .driver_info = IGNORE_DEVICE,
    },

    + { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
    + .driver_info = SEND_ZERO_PACKET,
    + },
    + { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
    + .driver_info = SEND_ZERO_PACKET,
    + },
    +
    /* control interfaces without any protocol set */
    { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
    USB_CDC_PROTO_NONE) },

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