1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
// SPDX-License-Identifier: GPL-2.0
/*
* u_f.h
*
* Utility definitions for USB functions
*
* Copyright (c) 2013 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
*/
#ifndef __U_F_H__
#define __U_F_H__
#include <linux/usb/gadget.h>
#include <linux/overflow.h>
/* Variable Length Array Macros **********************************************/
#define vla_group(groupname) size_t groupname##__next = 0
#define vla_group_size(groupname) groupname##__next
#define vla_item(groupname, type, name, n) \
size_t groupname##_##name##__offset = ({ \
size_t offset = 0; \
if (groupname##__next != SIZE_MAX) { \
size_t align_mask = __alignof__(type) - 1; \
size_t size = array_size(n, sizeof(type)); \
offset = (groupname##__next + align_mask) & \
~align_mask; \
if (check_add_overflow(offset, size, \
&groupname##__next)) { \
groupname##__next = SIZE_MAX; \
offset = 0; \
} \
} \
offset; \
})
#define vla_item_with_sz(groupname, type, name, n) \
size_t groupname##_##name##__sz = array_size(n, sizeof(type)); \
size_t groupname##_##name##__offset = ({ \
size_t offset = 0; \
if (groupname##__next != SIZE_MAX) { \
size_t align_mask = __alignof__(type) - 1; \
offset = (groupname##__next + align_mask) & \
~align_mask; \
if (check_add_overflow(offset, groupname##_##name##__sz,\
&groupname##__next)) { \
groupname##__next = SIZE_MAX; \
offset = 0; \
} \
} \
offset; \
})
#define vla_ptr(ptr, groupname, name) \
((void *) ((char *)ptr + groupname##_##name##__offset))
struct usb_ep;
struct usb_request;
/**
* 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
*
* 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);
/* Frees a usb_request previously allocated by alloc_ep_req() */
static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
{
WARN_ON(req->buf == NULL);
kfree(req->buf);
req->buf = NULL;
usb_ep_free_request(ep, req);
}
#endif /* __U_F_H__ */
|
