This is a note to let you know that I've just added the patch titled

usb: cdc-acm: send ZLP for Telit 3G Intel based modems

to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 34aabf918717dd14e05051896aaecd3b16b53d95 Mon Sep 17 00:00:00 2001

From: Daniele Palmas dnlplm@gmail.com Date: Fri, 28 Dec 2018 16:15:41 +0100 Subject: usb: cdc-acm: send ZLP for Telit 3G Intel based modems

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(+)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index ed8c62b2d9d1..739f8960811a 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1865,6 +1865,13 @@ static const struct usb_device_id acm_ids[] = { .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) },