3b48ece37e
commit e0466156ee2e944fb47a3fa00932c3698a6d2c67 upstream. Using usb_ep_align() makes sure that the buffer size for OUT endpoints is always aligned with wMaxPacketSize (512 usually). This makes sure that no buffer has the wrong size, which can cause nasty bugs. Signed-off-by: Felipe F. Tonello <eu@felipetonello.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
/*
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* u_f.h
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*
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* Utility definitions for USB functions
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*
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* Copyright (c) 2013 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __U_F_H__
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#define __U_F_H__
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#include <linux/usb/gadget.h>
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/* Variable Length Array Macros **********************************************/
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#define vla_group(groupname) size_t groupname##__next = 0
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#define vla_group_size(groupname) groupname##__next
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#define vla_item(groupname, type, name, n) \
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size_t groupname##_##name##__offset = ({ \
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size_t align_mask = __alignof__(type) - 1; \
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size_t offset = (groupname##__next + align_mask) & ~align_mask;\
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size_t size = (n) * sizeof(type); \
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groupname##__next = offset + size; \
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offset; \
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})
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#define vla_item_with_sz(groupname, type, name, n) \
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size_t groupname##_##name##__sz = (n) * sizeof(type); \
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size_t groupname##_##name##__offset = ({ \
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size_t align_mask = __alignof__(type) - 1; \
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size_t offset = (groupname##__next + align_mask) & ~align_mask;\
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size_t size = groupname##_##name##__sz; \
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groupname##__next = offset + size; \
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offset; \
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})
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#define vla_ptr(ptr, groupname, name) \
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((void *) ((char *)ptr + groupname##_##name##__offset))
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struct usb_ep;
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struct usb_request;
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/**
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* alloc_ep_req - returns a usb_request allocated by the gadget driver and
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* allocates the request's buffer.
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*
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* @ep: the endpoint to allocate a usb_request
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* @len: usb_requests's buffer suggested size
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* @default_len: used if @len is not provided, ie, is 0
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*
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* In case @ep direction is OUT, the @len will be aligned to ep's
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* wMaxPacketSize. In order to avoid memory leaks or drops, *always* use
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* usb_requests's length (req->length) to refer to the allocated buffer size.
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* Requests allocated via alloc_ep_req() *must* be freed by free_ep_req().
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*/
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struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len);
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/* Frees a usb_request previously allocated by alloc_ep_req() */
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static inline void free_ep_req(struct usb_ep *ep, struct usb_request *req)
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{
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kfree(req->buf);
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usb_ep_free_request(ep, req);
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}
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#endif /* __U_F_H__ */
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