From dde53ae3ad07b6b3978d5dc22633edbaa42db431 Mon Sep 17 00:00:00 2001 From: Lu Baolu Date: Wed, 6 Jan 2016 15:10:04 +0800 Subject: usb: cdc-acm: send zero packet for intel 7260 modem commit ffdb1e369a73b380fce95b05f8498d92c43842b4 upstream. For Intel 7260 modem, it is needed for host side to send zero packet if the BULK OUT size is equal to USB endpoint max packet length. Otherwise, modem side may still wait for more data and cannot give response to host side. Signed-off-by: Konrad Leszczynski Signed-off-by: Lu Baolu Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/usb/class/cdc-acm.c') diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 8cd193bbd044..e4c70dce3e7c 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1405,6 +1405,8 @@ made_compressed_probe: usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), NULL, acm->writesize, acm_write_bulk, snd); snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + if (quirks & SEND_ZERO_PACKET) + snd->urb->transfer_flags |= URB_ZERO_PACKET; snd->instance = acm; } @@ -1862,6 +1864,10 @@ static const struct usb_device_id acm_ids[] = { { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, USB_CDC_ACM_PROTO_AT_CDMA) }, + { USB_DEVICE(0x1519, 0x0452), /* Intel 7260 modem */ + .driver_info = SEND_ZERO_PACKET, + }, + { } }; -- cgit v1.2.3