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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e0466156ee
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>
35 lines
900 B
C
35 lines
900 B
C
/*
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* u_f.c -- USB function utilities for Gadget stack
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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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#include "u_f.h"
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#include <linux/usb/ch9.h>
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struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len)
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{
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struct usb_request *req;
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req = usb_ep_alloc_request(ep, GFP_ATOMIC);
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if (req) {
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req->length = len ?: default_len;
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if (usb_endpoint_dir_out(ep->desc))
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req->length = usb_ep_align(ep, req->length);
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req->buf = kmalloc(req->length, GFP_ATOMIC);
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if (!req->buf) {
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usb_ep_free_request(ep, req);
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req = NULL;
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}
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}
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return req;
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}
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EXPORT_SYMBOL_GPL(alloc_ep_req);
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