drivers/usb/gadget/u_f.c

   1 /*
   2  * u_f.c -- USB function utilities for Gadget stack
   3  *
   4  * Copyright (c) 2013 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include "u_f.h"
  15
  16 struct usb_request *alloc_ep_req(struct usb_ep *ep, int len, int default_len)
  17 {
  18         struct usb_request      *req;
  19
  20         req = usb_ep_alloc_request(ep, GFP_ATOMIC);
  21         if (req) {
  22                 req->length = len ?: default_len;
  23                 req->buf = kmalloc(req->length, GFP_ATOMIC);
  24                 if (!req->buf) {
  25                         usb_ep_free_request(ep, req);
  26                         req = NULL;
  27                 }
  28         }
  29         return req;
  30 }
  31 EXPORT_SYMBOL_GPL(alloc_ep_req);