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Commit d42666bd authored by Daniele Palmas's avatar Daniele Palmas Committed by Greg Kroah-Hartman
Browse files

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 5c467ac0

drivers/usb/class/cdc-acm.c

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