4.20-stable review patch. If anyone has any objections, please let me know.
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From: Daniele Palmas dnlplm@gmail.com
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
--- drivers/usb/class/cdc-acm.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1865,6 +1865,13 @@ static const struct usb_device_id acm_id .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) },