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

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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 <dnlplm@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniele Palmas 2018-12-28 16:15:41 +01:00 committed by Greg Kroah-Hartman
parent baf6b1921d
commit 6fffa14699
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/class/cdc-acm.c
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@ -1828,6 +1828,13 @@ 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) },