Commit | Line | Data |
---|---|---|
9e48565d AC |
1 | /* |
2 | * Tty port functions | |
3 | */ | |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <linux/errno.h> | |
7 | #include <linux/tty.h> | |
8 | #include <linux/tty_driver.h> | |
9 | #include <linux/tty_flip.h> | |
3e61696b | 10 | #include <linux/serial.h> |
9e48565d AC |
11 | #include <linux/timer.h> |
12 | #include <linux/string.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/bitops.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/module.h> | |
20 | ||
21 | void tty_port_init(struct tty_port *port) | |
22 | { | |
23 | memset(port, 0, sizeof(*port)); | |
24 | init_waitqueue_head(&port->open_wait); | |
25 | init_waitqueue_head(&port->close_wait); | |
bdc04e31 | 26 | init_waitqueue_head(&port->delta_msr_wait); |
9e48565d | 27 | mutex_init(&port->mutex); |
44e4909e | 28 | mutex_init(&port->buf_mutex); |
4a90f09b | 29 | spin_lock_init(&port->lock); |
9e48565d AC |
30 | port->close_delay = (50 * HZ) / 100; |
31 | port->closing_wait = (3000 * HZ) / 100; | |
568aafc6 | 32 | kref_init(&port->kref); |
9e48565d AC |
33 | } |
34 | EXPORT_SYMBOL(tty_port_init); | |
35 | ||
2cb4ca02 JS |
36 | /** |
37 | * tty_port_link_device - link tty and tty_port | |
38 | * @port: tty_port of the device | |
39 | * @driver: tty_driver for this device | |
40 | * @index: index of the tty | |
41 | * | |
42 | * Provide the tty layer wit ha link from a tty (specified by @index) to a | |
43 | * tty_port (@port). Use this only if neither tty_port_register_device nor | |
44 | * tty_port_install is used in the driver. If used, this has to be called before | |
45 | * tty_register_driver. | |
46 | */ | |
47 | void tty_port_link_device(struct tty_port *port, | |
48 | struct tty_driver *driver, unsigned index) | |
49 | { | |
50 | if (WARN_ON(index >= driver->num)) | |
51 | return; | |
52 | driver->ports[index] = port; | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(tty_port_link_device); | |
55 | ||
72a33bf5 JS |
56 | /** |
57 | * tty_port_register_device - register tty device | |
58 | * @port: tty_port of the device | |
59 | * @driver: tty_driver for this device | |
60 | * @index: index of the tty | |
61 | * @device: parent if exists, otherwise NULL | |
62 | * | |
63 | * It is the same as tty_register_device except the provided @port is linked to | |
64 | * a concrete tty specified by @index. Use this or tty_port_install (or both). | |
65 | * Call tty_port_link_device as a last resort. | |
66 | */ | |
057eb856 JS |
67 | struct device *tty_port_register_device(struct tty_port *port, |
68 | struct tty_driver *driver, unsigned index, | |
69 | struct device *device) | |
70 | { | |
2cb4ca02 | 71 | tty_port_link_device(port, driver, index); |
057eb856 JS |
72 | return tty_register_device(driver, index, device); |
73 | } | |
74 | EXPORT_SYMBOL_GPL(tty_port_register_device); | |
75 | ||
b1b79916 TH |
76 | /** |
77 | * tty_port_register_device_attr - register tty device | |
78 | * @port: tty_port of the device | |
79 | * @driver: tty_driver for this device | |
80 | * @index: index of the tty | |
81 | * @device: parent if exists, otherwise NULL | |
82 | * @drvdata: Driver data to be set to device. | |
83 | * @attr_grp: Attribute group to be set on device. | |
84 | * | |
85 | * It is the same as tty_register_device_attr except the provided @port is | |
86 | * linked to a concrete tty specified by @index. Use this or tty_port_install | |
87 | * (or both). Call tty_port_link_device as a last resort. | |
88 | */ | |
89 | struct device *tty_port_register_device_attr(struct tty_port *port, | |
90 | struct tty_driver *driver, unsigned index, | |
91 | struct device *device, void *drvdata, | |
92 | const struct attribute_group **attr_grp) | |
93 | { | |
94 | tty_port_link_device(port, driver, index); | |
95 | return tty_register_device_attr(driver, index, device, drvdata, | |
96 | attr_grp); | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(tty_port_register_device_attr); | |
99 | ||
9e48565d AC |
100 | int tty_port_alloc_xmit_buf(struct tty_port *port) |
101 | { | |
102 | /* We may sleep in get_zeroed_page() */ | |
44e4909e | 103 | mutex_lock(&port->buf_mutex); |
9e48565d AC |
104 | if (port->xmit_buf == NULL) |
105 | port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL); | |
44e4909e | 106 | mutex_unlock(&port->buf_mutex); |
9e48565d AC |
107 | if (port->xmit_buf == NULL) |
108 | return -ENOMEM; | |
109 | return 0; | |
110 | } | |
111 | EXPORT_SYMBOL(tty_port_alloc_xmit_buf); | |
112 | ||
113 | void tty_port_free_xmit_buf(struct tty_port *port) | |
114 | { | |
44e4909e | 115 | mutex_lock(&port->buf_mutex); |
9e48565d AC |
116 | if (port->xmit_buf != NULL) { |
117 | free_page((unsigned long)port->xmit_buf); | |
118 | port->xmit_buf = NULL; | |
119 | } | |
44e4909e | 120 | mutex_unlock(&port->buf_mutex); |
9e48565d AC |
121 | } |
122 | EXPORT_SYMBOL(tty_port_free_xmit_buf); | |
123 | ||
568aafc6 AC |
124 | static void tty_port_destructor(struct kref *kref) |
125 | { | |
126 | struct tty_port *port = container_of(kref, struct tty_port, kref); | |
127 | if (port->xmit_buf) | |
128 | free_page((unsigned long)port->xmit_buf); | |
129 | if (port->ops->destruct) | |
130 | port->ops->destruct(port); | |
131 | else | |
132 | kfree(port); | |
133 | } | |
134 | ||
135 | void tty_port_put(struct tty_port *port) | |
136 | { | |
137 | if (port) | |
138 | kref_put(&port->kref, tty_port_destructor); | |
139 | } | |
140 | EXPORT_SYMBOL(tty_port_put); | |
9e48565d | 141 | |
4a90f09b AC |
142 | /** |
143 | * tty_port_tty_get - get a tty reference | |
144 | * @port: tty port | |
145 | * | |
146 | * Return a refcount protected tty instance or NULL if the port is not | |
147 | * associated with a tty (eg due to close or hangup) | |
148 | */ | |
149 | ||
150 | struct tty_struct *tty_port_tty_get(struct tty_port *port) | |
151 | { | |
152 | unsigned long flags; | |
153 | struct tty_struct *tty; | |
154 | ||
155 | spin_lock_irqsave(&port->lock, flags); | |
156 | tty = tty_kref_get(port->tty); | |
157 | spin_unlock_irqrestore(&port->lock, flags); | |
158 | return tty; | |
159 | } | |
160 | EXPORT_SYMBOL(tty_port_tty_get); | |
161 | ||
162 | /** | |
163 | * tty_port_tty_set - set the tty of a port | |
164 | * @port: tty port | |
165 | * @tty: the tty | |
166 | * | |
167 | * Associate the port and tty pair. Manages any internal refcounts. | |
168 | * Pass NULL to deassociate a port | |
169 | */ | |
170 | ||
171 | void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty) | |
172 | { | |
173 | unsigned long flags; | |
174 | ||
175 | spin_lock_irqsave(&port->lock, flags); | |
176 | if (port->tty) | |
177 | tty_kref_put(port->tty); | |
cb4bca35 | 178 | port->tty = tty_kref_get(tty); |
4a90f09b AC |
179 | spin_unlock_irqrestore(&port->lock, flags); |
180 | } | |
181 | EXPORT_SYMBOL(tty_port_tty_set); | |
31f35939 | 182 | |
7ca0ff9a AC |
183 | static void tty_port_shutdown(struct tty_port *port) |
184 | { | |
64bc3979 | 185 | mutex_lock(&port->mutex); |
336cee42 | 186 | if (port->ops->shutdown && !port->console && |
1f5c13fa | 187 | test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) |
7ca0ff9a | 188 | port->ops->shutdown(port); |
64bc3979 | 189 | mutex_unlock(&port->mutex); |
7ca0ff9a AC |
190 | } |
191 | ||
3e61696b AC |
192 | /** |
193 | * tty_port_hangup - hangup helper | |
194 | * @port: tty port | |
195 | * | |
196 | * Perform port level tty hangup flag and count changes. Drop the tty | |
197 | * reference. | |
198 | */ | |
199 | ||
200 | void tty_port_hangup(struct tty_port *port) | |
201 | { | |
202 | unsigned long flags; | |
203 | ||
204 | spin_lock_irqsave(&port->lock, flags); | |
205 | port->count = 0; | |
206 | port->flags &= ~ASYNC_NORMAL_ACTIVE; | |
d74e8286 AC |
207 | if (port->tty) { |
208 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
3e61696b | 209 | tty_kref_put(port->tty); |
d74e8286 | 210 | } |
3e61696b AC |
211 | port->tty = NULL; |
212 | spin_unlock_irqrestore(&port->lock, flags); | |
213 | wake_up_interruptible(&port->open_wait); | |
bdc04e31 | 214 | wake_up_interruptible(&port->delta_msr_wait); |
7ca0ff9a | 215 | tty_port_shutdown(port); |
3e61696b AC |
216 | } |
217 | EXPORT_SYMBOL(tty_port_hangup); | |
218 | ||
31f35939 AC |
219 | /** |
220 | * tty_port_carrier_raised - carrier raised check | |
221 | * @port: tty port | |
222 | * | |
223 | * Wrapper for the carrier detect logic. For the moment this is used | |
224 | * to hide some internal details. This will eventually become entirely | |
225 | * internal to the tty port. | |
226 | */ | |
227 | ||
228 | int tty_port_carrier_raised(struct tty_port *port) | |
229 | { | |
230 | if (port->ops->carrier_raised == NULL) | |
231 | return 1; | |
232 | return port->ops->carrier_raised(port); | |
233 | } | |
234 | EXPORT_SYMBOL(tty_port_carrier_raised); | |
5d951fb4 AC |
235 | |
236 | /** | |
fcc8ac18 | 237 | * tty_port_raise_dtr_rts - Raise DTR/RTS |
5d951fb4 AC |
238 | * @port: tty port |
239 | * | |
240 | * Wrapper for the DTR/RTS raise logic. For the moment this is used | |
241 | * to hide some internal details. This will eventually become entirely | |
242 | * internal to the tty port. | |
243 | */ | |
244 | ||
245 | void tty_port_raise_dtr_rts(struct tty_port *port) | |
246 | { | |
fcc8ac18 AC |
247 | if (port->ops->dtr_rts) |
248 | port->ops->dtr_rts(port, 1); | |
5d951fb4 AC |
249 | } |
250 | EXPORT_SYMBOL(tty_port_raise_dtr_rts); | |
36c621d8 | 251 | |
fcc8ac18 AC |
252 | /** |
253 | * tty_port_lower_dtr_rts - Lower DTR/RTS | |
254 | * @port: tty port | |
255 | * | |
256 | * Wrapper for the DTR/RTS raise logic. For the moment this is used | |
257 | * to hide some internal details. This will eventually become entirely | |
258 | * internal to the tty port. | |
259 | */ | |
260 | ||
261 | void tty_port_lower_dtr_rts(struct tty_port *port) | |
262 | { | |
263 | if (port->ops->dtr_rts) | |
264 | port->ops->dtr_rts(port, 0); | |
265 | } | |
266 | EXPORT_SYMBOL(tty_port_lower_dtr_rts); | |
267 | ||
36c621d8 AC |
268 | /** |
269 | * tty_port_block_til_ready - Waiting logic for tty open | |
270 | * @port: the tty port being opened | |
271 | * @tty: the tty device being bound | |
272 | * @filp: the file pointer of the opener | |
273 | * | |
274 | * Implement the core POSIX/SuS tty behaviour when opening a tty device. | |
275 | * Handles: | |
276 | * - hangup (both before and during) | |
277 | * - non blocking open | |
278 | * - rts/dtr/dcd | |
279 | * - signals | |
280 | * - port flags and counts | |
281 | * | |
282 | * The passed tty_port must implement the carrier_raised method if it can | |
fcc8ac18 | 283 | * do carrier detect and the dtr_rts method if it supports software |
36c621d8 AC |
284 | * management of these lines. Note that the dtr/rts raise is done each |
285 | * iteration as a hangup may have previously dropped them while we wait. | |
286 | */ | |
d774a56d | 287 | |
36c621d8 AC |
288 | int tty_port_block_til_ready(struct tty_port *port, |
289 | struct tty_struct *tty, struct file *filp) | |
290 | { | |
291 | int do_clocal = 0, retval; | |
292 | unsigned long flags; | |
6af9a43d | 293 | DEFINE_WAIT(wait); |
36c621d8 AC |
294 | |
295 | /* block if port is in the process of being closed */ | |
296 | if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) { | |
89c8d91e | 297 | wait_event_interruptible_tty(tty, port->close_wait, |
5fc5b42a | 298 | !(port->flags & ASYNC_CLOSING)); |
36c621d8 AC |
299 | if (port->flags & ASYNC_HUP_NOTIFY) |
300 | return -EAGAIN; | |
301 | else | |
302 | return -ERESTARTSYS; | |
303 | } | |
304 | ||
305 | /* if non-blocking mode is set we can pass directly to open unless | |
306 | the port has just hung up or is in another error state */ | |
8627b96d AC |
307 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
308 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
309 | return 0; | |
310 | } | |
311 | if (filp->f_flags & O_NONBLOCK) { | |
4175f3e3 | 312 | /* Indicate we are open */ |
adc8d746 | 313 | if (tty->termios.c_cflag & CBAUD) |
4175f3e3 | 314 | tty_port_raise_dtr_rts(port); |
36c621d8 AC |
315 | port->flags |= ASYNC_NORMAL_ACTIVE; |
316 | return 0; | |
317 | } | |
318 | ||
319 | if (C_CLOCAL(tty)) | |
320 | do_clocal = 1; | |
321 | ||
322 | /* Block waiting until we can proceed. We may need to wait for the | |
323 | carrier, but we must also wait for any close that is in progress | |
324 | before the next open may complete */ | |
325 | ||
326 | retval = 0; | |
36c621d8 AC |
327 | |
328 | /* The port lock protects the port counts */ | |
329 | spin_lock_irqsave(&port->lock, flags); | |
330 | if (!tty_hung_up_p(filp)) | |
331 | port->count--; | |
332 | port->blocked_open++; | |
333 | spin_unlock_irqrestore(&port->lock, flags); | |
334 | ||
335 | while (1) { | |
336 | /* Indicate we are open */ | |
adc8d746 | 337 | if (tty->termios.c_cflag & CBAUD) |
7834909f | 338 | tty_port_raise_dtr_rts(port); |
36c621d8 | 339 | |
3e3b5c08 | 340 | prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE); |
d774a56d AC |
341 | /* Check for a hangup or uninitialised port. |
342 | Return accordingly */ | |
36c621d8 AC |
343 | if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) { |
344 | if (port->flags & ASYNC_HUP_NOTIFY) | |
345 | retval = -EAGAIN; | |
346 | else | |
347 | retval = -ERESTARTSYS; | |
348 | break; | |
349 | } | |
0eee50af JS |
350 | /* |
351 | * Probe the carrier. For devices with no carrier detect | |
352 | * tty_port_carrier_raised will always return true. | |
353 | * Never ask drivers if CLOCAL is set, this causes troubles | |
354 | * on some hardware. | |
355 | */ | |
36c621d8 | 356 | if (!(port->flags & ASYNC_CLOSING) && |
0eee50af | 357 | (do_clocal || tty_port_carrier_raised(port))) |
36c621d8 AC |
358 | break; |
359 | if (signal_pending(current)) { | |
360 | retval = -ERESTARTSYS; | |
361 | break; | |
362 | } | |
89c8d91e | 363 | tty_unlock(tty); |
36c621d8 | 364 | schedule(); |
89c8d91e | 365 | tty_lock(tty); |
36c621d8 | 366 | } |
3e3b5c08 | 367 | finish_wait(&port->open_wait, &wait); |
36c621d8 AC |
368 | |
369 | /* Update counts. A parallel hangup will have set count to zero and | |
370 | we must not mess that up further */ | |
371 | spin_lock_irqsave(&port->lock, flags); | |
372 | if (!tty_hung_up_p(filp)) | |
373 | port->count++; | |
374 | port->blocked_open--; | |
375 | if (retval == 0) | |
376 | port->flags |= ASYNC_NORMAL_ACTIVE; | |
377 | spin_unlock_irqrestore(&port->lock, flags); | |
ecc2e05e | 378 | return retval; |
36c621d8 AC |
379 | } |
380 | EXPORT_SYMBOL(tty_port_block_til_ready); | |
381 | ||
d774a56d AC |
382 | int tty_port_close_start(struct tty_port *port, |
383 | struct tty_struct *tty, struct file *filp) | |
a6614999 AC |
384 | { |
385 | unsigned long flags; | |
386 | ||
387 | spin_lock_irqsave(&port->lock, flags); | |
388 | if (tty_hung_up_p(filp)) { | |
389 | spin_unlock_irqrestore(&port->lock, flags); | |
390 | return 0; | |
391 | } | |
392 | ||
d774a56d | 393 | if (tty->count == 1 && port->count != 1) { |
a6614999 AC |
394 | printk(KERN_WARNING |
395 | "tty_port_close_start: tty->count = 1 port count = %d.\n", | |
396 | port->count); | |
397 | port->count = 1; | |
398 | } | |
399 | if (--port->count < 0) { | |
400 | printk(KERN_WARNING "tty_port_close_start: count = %d\n", | |
401 | port->count); | |
402 | port->count = 0; | |
403 | } | |
404 | ||
405 | if (port->count) { | |
406 | spin_unlock_irqrestore(&port->lock, flags); | |
7ca0ff9a AC |
407 | if (port->ops->drop) |
408 | port->ops->drop(port); | |
a6614999 AC |
409 | return 0; |
410 | } | |
1f5c13fa | 411 | set_bit(ASYNCB_CLOSING, &port->flags); |
a6614999 AC |
412 | tty->closing = 1; |
413 | spin_unlock_irqrestore(&port->lock, flags); | |
fba85e01 AC |
414 | /* Don't block on a stalled port, just pull the chain */ |
415 | if (tty->flow_stopped) | |
416 | tty_driver_flush_buffer(tty); | |
7ca0ff9a | 417 | if (test_bit(ASYNCB_INITIALIZED, &port->flags) && |
6ed1dbae | 418 | port->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
424cc039 | 419 | tty_wait_until_sent_from_close(tty, port->closing_wait); |
1ec739be AC |
420 | if (port->drain_delay) { |
421 | unsigned int bps = tty_get_baud_rate(tty); | |
422 | long timeout; | |
423 | ||
424 | if (bps > 1200) | |
d774a56d AC |
425 | timeout = max_t(long, |
426 | (HZ * 10 * port->drain_delay) / bps, HZ / 10); | |
1ec739be AC |
427 | else |
428 | timeout = 2 * HZ; | |
429 | schedule_timeout_interruptible(timeout); | |
430 | } | |
e707c35c AC |
431 | /* Flush the ldisc buffering */ |
432 | tty_ldisc_flush(tty); | |
433 | ||
434 | /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to | |
435 | hang up the line */ | |
adc8d746 | 436 | if (tty->termios.c_cflag & HUPCL) |
e707c35c AC |
437 | tty_port_lower_dtr_rts(port); |
438 | ||
7ca0ff9a AC |
439 | /* Don't call port->drop for the last reference. Callers will want |
440 | to drop the last active reference in ->shutdown() or the tty | |
441 | shutdown path */ | |
a6614999 AC |
442 | return 1; |
443 | } | |
444 | EXPORT_SYMBOL(tty_port_close_start); | |
445 | ||
446 | void tty_port_close_end(struct tty_port *port, struct tty_struct *tty) | |
447 | { | |
448 | unsigned long flags; | |
449 | ||
a6614999 AC |
450 | spin_lock_irqsave(&port->lock, flags); |
451 | tty->closing = 0; | |
452 | ||
453 | if (port->blocked_open) { | |
454 | spin_unlock_irqrestore(&port->lock, flags); | |
455 | if (port->close_delay) { | |
456 | msleep_interruptible( | |
457 | jiffies_to_msecs(port->close_delay)); | |
458 | } | |
459 | spin_lock_irqsave(&port->lock, flags); | |
460 | wake_up_interruptible(&port->open_wait); | |
461 | } | |
462 | port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING); | |
463 | wake_up_interruptible(&port->close_wait); | |
464 | spin_unlock_irqrestore(&port->lock, flags); | |
465 | } | |
466 | EXPORT_SYMBOL(tty_port_close_end); | |
7ca0ff9a AC |
467 | |
468 | void tty_port_close(struct tty_port *port, struct tty_struct *tty, | |
469 | struct file *filp) | |
470 | { | |
471 | if (tty_port_close_start(port, tty, filp) == 0) | |
472 | return; | |
473 | tty_port_shutdown(port); | |
d74e8286 | 474 | set_bit(TTY_IO_ERROR, &tty->flags); |
7ca0ff9a AC |
475 | tty_port_close_end(port, tty); |
476 | tty_port_tty_set(port, NULL); | |
477 | } | |
478 | EXPORT_SYMBOL(tty_port_close); | |
64bc3979 | 479 | |
72a33bf5 JS |
480 | /** |
481 | * tty_port_install - generic tty->ops->install handler | |
482 | * @port: tty_port of the device | |
483 | * @driver: tty_driver for this device | |
484 | * @tty: tty to be installed | |
485 | * | |
486 | * It is the same as tty_standard_install except the provided @port is linked | |
487 | * to a concrete tty specified by @tty. Use this or tty_port_register_device | |
488 | * (or both). Call tty_port_link_device as a last resort. | |
489 | */ | |
695586ca JS |
490 | int tty_port_install(struct tty_port *port, struct tty_driver *driver, |
491 | struct tty_struct *tty) | |
492 | { | |
493 | tty->port = port; | |
494 | return tty_standard_install(driver, tty); | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(tty_port_install); | |
497 | ||
64bc3979 | 498 | int tty_port_open(struct tty_port *port, struct tty_struct *tty, |
d774a56d | 499 | struct file *filp) |
64bc3979 AC |
500 | { |
501 | spin_lock_irq(&port->lock); | |
502 | if (!tty_hung_up_p(filp)) | |
503 | ++port->count; | |
504 | spin_unlock_irq(&port->lock); | |
505 | tty_port_tty_set(port, tty); | |
506 | ||
507 | /* | |
508 | * Do the device-specific open only if the hardware isn't | |
509 | * already initialized. Serialize open and shutdown using the | |
510 | * port mutex. | |
511 | */ | |
512 | ||
513 | mutex_lock(&port->mutex); | |
514 | ||
515 | if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) { | |
a9a37ec3 | 516 | clear_bit(TTY_IO_ERROR, &tty->flags); |
64bc3979 AC |
517 | if (port->ops->activate) { |
518 | int retval = port->ops->activate(port, tty); | |
519 | if (retval) { | |
d774a56d AC |
520 | mutex_unlock(&port->mutex); |
521 | return retval; | |
522 | } | |
523 | } | |
64bc3979 AC |
524 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
525 | } | |
526 | mutex_unlock(&port->mutex); | |
527 | return tty_port_block_til_ready(port, tty, filp); | |
528 | } | |
529 | ||
530 | EXPORT_SYMBOL(tty_port_open); |