1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * u_f.c -- USB function utilities for Gadget stack 4 * 5 * Copyright (c) 2013 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com 7 * 8 * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com> 9 */ 10 11 #include "u_f.h" 12 #include <linux/usb/ch9.h> 13 14 struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len) 15 { 16 struct usb_request *req; 17 18 req = usb_ep_alloc_request(ep, GFP_ATOMIC); 19 if (req) { 20 req->length = usb_endpoint_dir_out(ep->desc) ? 21 usb_ep_align(ep, len) : len; 22 req->buf = kmalloc(req->length, GFP_ATOMIC); 23 if (!req->buf) { 24 usb_ep_free_request(ep, req); 25 req = NULL; 26 } 27 } 28 return req; 29 } 30 EXPORT_SYMBOL_GPL(alloc_ep_req); 31