xref: /freebsd/sys/dev/drm2/drm_linux_list_sort.c (revision 4d846d26)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2011 The FreeBSD Foundation
5  *
6  * This software was developed by Konstantin Belousov under sponsorship from
7  * the FreeBSD Foundation.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 #include <dev/drm2/drmP.h>
32 __FBSDID("$FreeBSD$");
33 
34 struct drm_list_sort_thunk {
35 	int (*cmp)(void *, struct list_head *, struct list_head *);
36 	void *priv;
37 };
38 
39 static int
40 drm_le_cmp(const void *d1, const void *d2, void *priv)
41 {
42 	struct list_head *le1, *le2;
43 	struct drm_list_sort_thunk *thunk;
44 
45 	thunk = priv;
46 	le1 = *(__DECONST(struct list_head **, d1));
47 	le2 = *(__DECONST(struct list_head **, d2));
48 	return ((thunk->cmp)(thunk->priv, le1, le2));
49 }
50 
51 /*
52  * Punt and use array sort.
53  */
54 void
55 drm_list_sort(void *priv, struct list_head *head, int (*cmp)(void *priv,
56     struct list_head *a, struct list_head *b))
57 {
58 	struct drm_list_sort_thunk thunk;
59 	struct list_head **ar, *le;
60 	int count, i;
61 
62 	count = 0;
63 	list_for_each(le, head)
64 		count++;
65 	ar = malloc(sizeof(struct list_head *) * count, M_TEMP, M_WAITOK);
66 	i = 0;
67 	list_for_each(le, head)
68 		ar[i++] = le;
69 	thunk.cmp = cmp;
70 	thunk.priv = priv;
71 	qsort_r(ar, count, sizeof(struct list_head *), drm_le_cmp, &thunk);
72 	INIT_LIST_HEAD(head);
73 	for (i = 0; i < count; i++)
74 		list_add_tail(ar[i], head);
75 	free(ar, M_TEMP);
76 }
77