Commit ffdb1e36 authored by Lu Baolu's avatar Lu Baolu Committed by Greg Kroah-Hartman

usb: cdc-acm: send zero packet for intel 7260 modem

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: default avatarKonrad Leszczynski <konrad.leszczynski@intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 19454462
......@@ -1405,6 +1405,8 @@ static int acm_probe(struct usb_interface *intf,
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,
},
{ }
};
......
......@@ -134,3 +134,4 @@ struct acm {
#define IGNORE_DEVICE BIT(5)
#define QUIRK_CONTROL_LINE_STATE BIT(6)
#define CLEAR_HALT_CONDITIONS BIT(7)
#define SEND_ZERO_PACKET BIT(8)
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