carl9170: fix memory leak issue in async cmd macro wrappers
[linux-2.6.git] / drivers / net / wireless / ath / carl9170 / cmd.h
1 /*
2  * Atheros CARL9170 driver
3  *
4  * Basic HW register/memory/command access functions
5  *
6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7  * Copyright 2010, Christian Lamparter <chunkeey@googlemail.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; see the file COPYING.  If not, see
21  * http://www.gnu.org/licenses/.
22  *
23  * This file incorporates work covered by the following copyright and
24  * permission notice:
25  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
26  *
27  *    Permission to use, copy, modify, and/or distribute this software for any
28  *    purpose with or without fee is hereby granted, provided that the above
29  *    copyright notice and this permission notice appear in all copies.
30  *
31  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
32  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
33  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
34  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
35  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
36  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
37  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
38  */
39 #ifndef __CMD_H
40 #define __CMD_H
41
42 #include "carl9170.h"
43
44 /* basic HW access */
45 int carl9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val);
46 int carl9170_read_reg(struct ar9170 *ar, const u32 reg, u32 *val);
47 int carl9170_read_mreg(struct ar9170 *ar, const int nregs,
48                        const u32 *regs, u32 *out);
49 int carl9170_echo_test(struct ar9170 *ar, u32 v);
50 int carl9170_reboot(struct ar9170 *ar);
51 int carl9170_mac_reset(struct ar9170 *ar);
52 int carl9170_powersave(struct ar9170 *ar, const bool power_on);
53 int carl9170_bcn_ctrl(struct ar9170 *ar, const unsigned int vif_id,
54                        const u32 mode, const u32 addr, const u32 len);
55
56 static inline int carl9170_flush_cab(struct ar9170 *ar,
57                                      const unsigned int vif_id)
58 {
59         return carl9170_bcn_ctrl(ar, vif_id, CARL9170_BCN_CTRL_DRAIN, 0, 0);
60 }
61
62 static inline int carl9170_rx_filter(struct ar9170 *ar,
63                                      const unsigned int _rx_filter)
64 {
65         __le32 rx_filter = cpu_to_le32(_rx_filter);
66
67         return carl9170_exec_cmd(ar, CARL9170_CMD_RX_FILTER,
68                                 sizeof(rx_filter), (u8 *)&rx_filter,
69                                 0, NULL);
70 }
71
72 struct carl9170_cmd *carl9170_cmd_buf(struct ar9170 *ar,
73         const enum carl9170_cmd_oids cmd, const unsigned int len);
74
75 /*
76  * Macros to facilitate writing multiple registers in a single
77  * write-combining USB command. Note that when the first group
78  * fails the whole thing will fail without any others attempted,
79  * but you won't know which write in the group failed.
80  */
81 #define carl9170_regwrite_begin(ar)                                     \
82 do {                                                                    \
83         int __nreg = 0, __err = 0;                                      \
84         struct ar9170 *__ar = ar;
85
86 #define carl9170_regwrite(r, v) do {                                    \
87         __ar->cmd_buf[2 * __nreg + 1] = cpu_to_le32(r);                 \
88         __ar->cmd_buf[2 * __nreg + 2] = cpu_to_le32(v);                 \
89         __nreg++;                                                       \
90         if ((__nreg >= PAYLOAD_MAX/2)) {                                \
91                 if (IS_ACCEPTING_CMD(__ar))                             \
92                         __err = carl9170_exec_cmd(__ar,                 \
93                                 CARL9170_CMD_WREG, 8 * __nreg,          \
94                                 (u8 *) &__ar->cmd_buf[1], 0, NULL);     \
95                 else                                                    \
96                         goto __regwrite_out;                            \
97                                                                         \
98                 __nreg = 0;                                             \
99                 if (__err)                                              \
100                         goto __regwrite_out;                            \
101         }                                                               \
102 } while (0)
103
104 #define carl9170_regwrite_finish()                                      \
105 __regwrite_out :                                                        \
106         if (__err == 0 && __nreg) {                                     \
107                 if (IS_ACCEPTING_CMD(__ar))                             \
108                         __err = carl9170_exec_cmd(__ar,                 \
109                                 CARL9170_CMD_WREG, 8 * __nreg,          \
110                                 (u8 *) &__ar->cmd_buf[1], 0, NULL);     \
111                 __nreg = 0;                                             \
112         }
113
114 #define carl9170_regwrite_result()                                      \
115         __err;                                                          \
116 } while (0);
117
118
119 #define carl9170_async_regwrite_get_buf()                               \
120 do {                                                                    \
121         __nreg = 0;                                                     \
122         __cmd = carl9170_cmd_buf(__carl, CARL9170_CMD_WREG_ASYNC,       \
123                                  CARL9170_MAX_CMD_PAYLOAD_LEN);         \
124         if (__cmd == NULL) {                                            \
125                 __err = -ENOMEM;                                        \
126                 goto __async_regwrite_out;                              \
127         }                                                               \
128 } while (0);
129
130 #define carl9170_async_regwrite_begin(carl)                             \
131 do {                                                                    \
132         struct ar9170 *__carl = carl;                                   \
133         struct carl9170_cmd *__cmd;                                     \
134         unsigned int __nreg;                                            \
135         int  __err = 0;                                                 \
136         carl9170_async_regwrite_get_buf();                              \
137
138 #define carl9170_async_regwrite_flush()                                 \
139 do {                                                                    \
140         if (__cmd == NULL || __nreg == 0)                               \
141                 break;                                                  \
142                                                                         \
143         if (IS_ACCEPTING_CMD(__carl) && __nreg) {                       \
144                 __cmd->hdr.len = 8 * __nreg;                            \
145                 __err = __carl9170_exec_cmd(__carl, __cmd, true);       \
146                 __cmd = NULL;                                           \
147                 break;                                                  \
148         }                                                               \
149         goto __async_regwrite_out;                                      \
150 } while (0)
151
152 #define carl9170_async_regwrite(r, v) do {                              \
153         if (__cmd == NULL)                                              \
154                 carl9170_async_regwrite_get_buf();                      \
155         __cmd->wreg.regs[__nreg].addr = cpu_to_le32(r);                 \
156         __cmd->wreg.regs[__nreg].val = cpu_to_le32(v);                  \
157         __nreg++;                                                       \
158         if ((__nreg >= PAYLOAD_MAX / 2))                                \
159                 carl9170_async_regwrite_flush();                        \
160 } while (0)
161
162 #define carl9170_async_regwrite_finish() do {                           \
163 __async_regwrite_out :                                                  \
164         if (__cmd != NULL && __err == 0)                                \
165                 carl9170_async_regwrite_flush();                        \
166         kfree(__cmd);                                                   \
167 } while (0)                                                             \
168
169 #define carl9170_async_regwrite_result()                                \
170         __err;                                                          \
171 } while (0);
172
173 #endif /* __CMD_H */