1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
--- a/nozomi.c
+++ b/nozomi.c
@@ -7,6 +7,9 @@
*
* Maintained by: Paul Hardwick, p.hardwick@option.com
*
+ * Patches:
+ * Locking code changes for Vodafone, Andrew Bird & Phil Sanderson
+ *
* Source has been ported from an implementation made by Filip Aben, f.aben@option.com
*
* --------------------------------------------------------------------------
@@ -61,6 +64,7 @@
#include <linux/interrupt.h>
#include <linux/kmod.h>
#include <linux/proc_fs.h>
+#include <linux/init.h>
#include <asm/uaccess.h>
@@ -133,23 +137,23 @@ static int nzdebug = NOZOMI_DEBUG_LEVEL;
/* TODO: rewrite to optimize macros... */
#define SET_FCR(value__) \
do { \
- writew((value__), (void*) (dc->REG_FCR )); \
+ writew((value__), (dc->REG_FCR )); \
} while(0)
#define SET_IER(value__, mask__) \
do { \
dc->ier_last_written = (dc->ier_last_written & ~mask__) | (value__ & mask__ );\
- writew( dc->ier_last_written, (void*) (dc->REG_IER));\
+ writew( dc->ier_last_written, (dc->REG_IER));\
} while(0)
#define GET_IER(read_val__) \
do { \
- (read_val__) = readw((void*) (dc->REG_IER));\
+ (read_val__) = readw((dc->REG_IER));\
} while(0)
#define GET_IIR(read_val__) \
do { \
- (read_val__) = readw((void*) (dc->REG_IIR));\
+ (read_val__) = readw( (dc->REG_IIR));\
} while(0)
#define GET_MEM(value__, addr__, length__) \
@@ -265,7 +269,7 @@ static int nzdebug = NOZOMI_DEBUG_LEVEL;
/* There are two types of nozomi cards, one with 2048 memory and with 8192 memory */
typedef enum {
F32_2 = 2048, /* Has 512 bytes downlink and uplink * 2 -> 2048 */
- F32_8 = 9192, /* Has 3072 bytes downlink and 1024 bytes uplink * 2 -> 8192 */
+ F32_8 = 8192, /* Has 3072 bytes downlink and 1024 bytes uplink * 2 -> 8192 */
} card_type_t;
/* Two different toggle channels exist */
@@ -438,12 +442,12 @@ typedef struct {
u32 base_addr;
u8 closing;
- /* Register addresses */
- u32 REG_IIR;
- u32 REG_FCR;
- u32 REG_IER;
+ /* Pointers to registers ( register is tagged volatile, not pointer ) */
+ volatile u16 * REG_IIR;
+ volatile u16 * REG_FCR;
+ volatile u16 * REG_IER;
- volatile u16 ier_last_written;
+ u16 ier_last_written;
card_type_t card_type;
config_table_t config_table; /* Configuration table */
struct pci_dev *pdev;
@@ -490,7 +494,7 @@ static struct pci_device_id nozomi_pci_t
/* Used to store interrupt variables */
typedef struct {
- volatile u16 read_iir; /* Holds current interrupt tokens */
+ u16 read_iir; /* Holds current interrupt tokens */
} irq_t;
MODULE_DEVICE_TABLE(pci, nozomi_pci_tbl);
@@ -1345,9 +1349,9 @@ void nozomi_setup_private_data(dc_t *dc)
u32 offset = dc->base_addr + dc->card_type/2;
int i;
- dc->REG_FCR = offset + R_FCR;
- dc->REG_IIR = offset + R_IIR;
- dc->REG_IER = offset + R_IER;
+ dc->REG_FCR = (u16 *) (offset + R_FCR);
+ dc->REG_IIR = (u16 *) (offset + R_IIR);
+ dc->REG_IER = (u16 *) (offset + R_IER);
dc->ier_last_written = 0;
dc->closing = 0;
@@ -1366,13 +1370,16 @@ void nozomi_setup_private_data(dc_t *dc)
static void tty_flip_queue_function(void *tmp_dc) {
dc_t *dc = (dc_t*) tmp_dc;
int i;
+ u32 flags;
/* Enable interrupt for that port */
for(i=0;i<MAX_PORT;i++) {
if (dc->port[i].tty_dont_flip) {
D6("Enable for port: %d", i);
dc->port[i].tty_dont_flip = 0;
+ spin_lock_irqsave(&dc->spin_mutex, flags);
enable_transmit_dl(dc->port[i].tty_index, dc);
+ spin_unlock_irqrestore(&dc->spin_mutex, flags);
}
}
}
@@ -1555,7 +1562,11 @@ err_disable_device:
static void tty_do_close(dc_t *dc, port_t *port) {
- down(&port->tty_sem);
+ u32 flags;
+
+ if(down_interruptible(&port->tty_sem)){
+ return;
+ }
if ( !port->tty_open_count ) {
goto exit;
@@ -1569,7 +1580,9 @@ static void tty_do_close(dc_t *dc, port_
if ( port->tty_open_count == 0) {
D1("close: %d", port->token_dl );
+ spin_lock_irqsave(&dc->spin_mutex, flags);
SET_IER( 0, port->token_dl );
+ spin_unlock_irqrestore(&dc->spin_mutex, flags);
}
exit:
@@ -1679,8 +1692,11 @@ static int ntty_open(struct tty_struct *
s32 index = get_index(tty);
port_t *port = get_port_by_tty(tty);
dc_t *dc = get_dc_by_tty(tty);
+ u32 flags;
- down(&port->tty_sem);
+ if(down_interruptible(&port->tty_sem)){
+ return -ERESTARTSYS;
+ }
tty->low_latency = 1;
tty->driver_data = port;
@@ -1698,7 +1714,9 @@ static int ntty_open(struct tty_struct *
if ( port->tty_open_count == 1) {
port->rx_data = port->tx_data = 0;
D1("open: %d", port->token_dl );
+ spin_lock_irqsave(&dc->spin_mutex, flags);
SET_IER( port->token_dl, port->token_dl );
+ spin_unlock_irqrestore(&dc->spin_mutex, flags);
}
up(&port->tty_sem);
@@ -1722,6 +1740,7 @@ static s32 ntty_write(struct tty_struct
int rval = -EINVAL;
dc_t *dc = get_dc_by_tty(tty);
port_t *port = (port_t *) tty->driver_data;
+ u32 flags;
/* D1( "WRITEx: %d, index = %d", count, index); */
@@ -1729,7 +1748,10 @@ static s32 ntty_write(struct tty_struct
return -ENODEV;
}
- down(&port->tty_sem);
+ if(down_trylock(&port->tty_sem) ) { // must test lock as tty layer wraps calls to this function with BKL
+ ERR("Would have deadlocked - return ERESTARTSYS");
+ return -ERESTARTSYS;
+ }
if (! port->tty_open_count) {
D1( " ");
@@ -1752,6 +1774,7 @@ static s32 ntty_write(struct tty_struct
goto exit;
}
+ spin_lock_irqsave(&dc->spin_mutex, flags);
// CTS is only valid on the modem channel
if ( port == &(dc->port[PORT_MDM]) ) {
if ( port->ctrl_dl.CTS ) {
@@ -1763,6 +1786,7 @@ static s32 ntty_write(struct tty_struct
} else {
enable_transmit_ul(port->tty_index, dc );
}
+ spin_unlock_irqrestore(&dc->spin_mutex, flags);
exit:
up(&port->tty_sem);
@@ -1782,7 +1806,9 @@ static int ntty_write_room(struct tty_st
return 0;
}
- down(&port->tty_sem);
+ if(down_interruptible(&port->tty_sem)){
+ return 0;
+ }
if (! port->tty_open_count) {
goto exit;
@@ -1969,6 +1995,8 @@ static int ntty_ioctl_tiocgicount(struct
static int ntty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) {
port_t *port = (port_t *) tty->driver_data;
+ dc_t *dc = get_dc_by_tty(tty);
+ u32 flags;
int mask;
int rval = -ENOIOCTLCMD;
@@ -1991,7 +2019,9 @@ static int ntty_ioctl(struct tty_struct
rval = ntty_ioctl_tiocgicount(tty, file, cmd, arg);
break;
case TIOCMGET:
+ spin_lock_irqsave(&dc->spin_mutex, flags);
rval = ntty_tiocmget(tty, file);
+ spin_unlock_irqrestore(&dc->spin_mutex, flags);
break;
case TIOCMSET:
rval = ntty_tiocmset(tty, file, arg);
@@ -2000,20 +2030,24 @@ static int ntty_ioctl(struct tty_struct
if (get_user(mask, (unsigned long *) arg))
return -EFAULT;
+ spin_lock_irqsave(&dc->spin_mutex, flags);
if (mask & TIOCM_RTS)
set_rts(port->tty_index, 0);
if (mask & TIOCM_DTR)
set_dtr(port->tty_index, 0);
+ spin_unlock_irqrestore(&dc->spin_mutex, flags);
rval = 0;
break;
case TIOCMBIS:
if (get_user(mask, (unsigned long *) arg))
return -EFAULT;
+ spin_lock_irqsave(&dc->spin_mutex, flags);
if (mask & TIOCM_RTS)
set_rts(port->tty_index, 1);
if (mask & TIOCM_DTR)
set_dtr(port->tty_index, 1);
+ spin_unlock_irqrestore(&dc->spin_mutex, flags);
rval = 0;
break;
case TCFLSH:
|
