From d42666bd9f35a91ef870344d27b86f5bb1bfe220 Mon Sep 17 00:00:00 2001 From: Daniele Palmas Date: Fri, 28 Dec 2018 16:15:41 +0100 Subject: [PATCH] usb: cdc-acm: send ZLP for Telit 3G Intel based modems 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 Cc: stable Signed-off-by: Greg Kroah-Hartman --- 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 423a339e53bc..8ab0195f8d32 100644 --- 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_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) }, -- 2.49.0