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Commit 51b2a8e2 authored by Daniele Palmas's avatar Daniele Palmas Committed by Greg Kroah-Hartman
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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: default avatarDaniele Palmas <dnlplm@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2a71a47e

drivers/usb/class/cdc-acm.c

+7 −0
Original line number Diff line number Diff line
@@ -1880,6 +1880,13 @@ 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) },