usb: gadget: align buffer size when allocating for OUT endpoint

 */

#include "u_f.h"

#include <linux/usb/ch9.h>

struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len)

{

	req = usb_ep_alloc_request(ep, GFP_ATOMIC);

	if (req) {

		req->length = len ?: default_len;

		if (usb_endpoint_dir_out(ep->desc))

			req->length = usb_ep_align(ep, req->length);

		req->buf = kmalloc(req->length, GFP_ATOMIC);

		if (!req->buf) {

			usb_ep_free_request(ep, req);

struct usb_ep;

struct usb_request;

/* Requests allocated via alloc_ep_req() must be freed by free_ep_req(). */

/**

 * alloc_ep_req - returns a usb_request allocated by the gadget driver and

 * allocates the request's buffer.

 *

 * @ep: the endpoint to allocate a usb_request

 * @len: usb_requests's buffer suggested size

 * @default_len: used if @len is not provided, ie, is 0

 *

 * In case @ep direction is OUT, the @len will be aligned to ep's

 * wMaxPacketSize. In order to avoid memory leaks or drops, *always* use

 * usb_requests's length (req->length) to refer to the allocated buffer size.

 * Requests allocated via alloc_ep_req() *must* be freed by free_ep_req().

 */

struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len);

/* Frees a usb_request previously allocated by alloc_ep_req() */

static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)

{

	kfree(req->buf);