usb: cdc-acm: send ZLP for Telit 3G Intel based modems (34aabf91) · Commits · 戴 / test

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:

drivers/usb/class/cdc-acm.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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) },