1 /******************************************************************************
2 *
3 * Copyright(c) 2007 - 2017 Realtek Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 *****************************************************************************/
15
16 #include <drv_types.h>
17
18 #if defined(CONFIG_RTW_WDS) || defined(CONFIG_RTW_MESH) /* for now, only promised for kernel versions we support mesh */
19
rtw_rhashtable_walk_enter(rtw_rhashtable * ht,rtw_rhashtable_iter * iter)20 int rtw_rhashtable_walk_enter(rtw_rhashtable *ht, rtw_rhashtable_iter *iter)
21 {
22 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
23 rhashtable_walk_enter((ht), (iter));
24 return 0;
25 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0))
26 return rhashtable_walk_init((ht), (iter), GFP_ATOMIC);
27 #else
28 /* kernel >= 4.4.0 rhashtable_walk_init use GFP_KERNEL to alloc, spin_lock for assignment */
29 iter->ht = ht;
30 iter->p = NULL;
31 iter->slot = 0;
32 iter->skip = 0;
33
34 iter->walker = kmalloc(sizeof(*iter->walker), GFP_ATOMIC);
35 if (!iter->walker)
36 return -ENOMEM;
37
38 spin_lock(&ht->lock);
39 iter->walker->tbl =
40 rcu_dereference_protected(ht->tbl, lockdep_is_held(&ht->lock));
41 list_add(&iter->walker->list, &iter->walker->tbl->walkers);
42 spin_unlock(&ht->lock);
43
44 return 0;
45 #endif
46 }
47
48 #if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0))
49 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0))
50 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
is_vmalloc_addr(const void * x)51 static inline int is_vmalloc_addr(const void *x)
52 {
53 #ifdef CONFIG_MMU
54 unsigned long addr = (unsigned long)x;
55
56 return addr >= VMALLOC_START && addr < VMALLOC_END;
57 #else
58 return 0;
59 #endif
60 }
61 #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25)) */
62
kvfree(const void * addr)63 void kvfree(const void *addr)
64 {
65 if (is_vmalloc_addr(addr))
66 vfree(addr);
67 else
68 kfree(addr);
69 }
70 #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)) */
71
72 #include "rhashtable.c"
73
74 #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)) */
75
76 #endif /* defined(CONFIG_RTW_WDS) || defined(CONFIG_RTW_MESH) */
77
78