Merge "usb: smd: Send zero length packets in modem data calls"

/*

 * u_smd.c - utilities for USB gadget serial over smd

 *

 * Copyright (c) 2011, The Linux Foundation. All rights reserved.

 * Copyright (c) 2011, 2013, The Linux Foundation. All rights reserved.

 *

 * This code also borrows from drivers/usb/gadget/u_serial.c, which is

 * Copyright (C) 2000 - 2003 Al Borchers (alborchers@steinerpoint.com)

		req = list_entry(pool->next, struct usb_request, list);

		list_del(&req->list);

		req->length = smd_read(pi->ch, req->buf, avail);

		req->zero = 1;

		spin_unlock_irq(&port->port_lock);

		ret = usb_ep_queue(in, req, GFP_KERNEL);