drivers/usb/gadget/u_f.c

   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 <andrzejtp2010@gmail.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);