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

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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 <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Daniele Palmas 2018-12-28 16:15:41 +01:00 • committed by Greg Kroah-Hartman
commit 34aabf9187
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/class/cdc-acm.c
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@ -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) },