Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d94ba80e RC |
2 | /* |
3 | * PTP 1588 clock support - character device implementation. | |
4 | * | |
5 | * Copyright (C) 2010 OMICRON electronics GmbH | |
d94ba80e RC |
6 | */ |
7 | #include <linux/module.h> | |
8 | #include <linux/posix-clock.h> | |
9 | #include <linux/poll.h> | |
10 | #include <linux/sched.h> | |
c7ec0bad | 11 | #include <linux/slab.h> |
719f1aa4 | 12 | #include <linux/timekeeping.h> |
d94ba80e | 13 | |
efa61c8c GS |
14 | #include <linux/nospec.h> |
15 | ||
d94ba80e RC |
16 | #include "ptp_private.h" |
17 | ||
6092315d RC |
18 | static int ptp_disable_pinfunc(struct ptp_clock_info *ops, |
19 | enum ptp_pin_function func, unsigned int chan) | |
20 | { | |
21 | struct ptp_clock_request rq; | |
22 | int err = 0; | |
23 | ||
24 | memset(&rq, 0, sizeof(rq)); | |
25 | ||
26 | switch (func) { | |
27 | case PTP_PF_NONE: | |
28 | break; | |
29 | case PTP_PF_EXTTS: | |
30 | rq.type = PTP_CLK_REQ_EXTTS; | |
31 | rq.extts.index = chan; | |
32 | err = ops->enable(ops, &rq, 0); | |
33 | break; | |
34 | case PTP_PF_PEROUT: | |
35 | rq.type = PTP_CLK_REQ_PEROUT; | |
36 | rq.perout.index = chan; | |
37 | err = ops->enable(ops, &rq, 0); | |
38 | break; | |
39 | case PTP_PF_PHYSYNC: | |
40 | break; | |
41 | default: | |
42 | return -EINVAL; | |
43 | } | |
44 | ||
45 | return err; | |
46 | } | |
47 | ||
48 | int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin, | |
49 | enum ptp_pin_function func, unsigned int chan) | |
50 | { | |
51 | struct ptp_clock_info *info = ptp->info; | |
52 | struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin]; | |
53 | unsigned int i; | |
54 | ||
55 | /* Check to see if any other pin previously had this function. */ | |
56 | for (i = 0; i < info->n_pins; i++) { | |
57 | if (info->pin_config[i].func == func && | |
58 | info->pin_config[i].chan == chan) { | |
59 | pin1 = &info->pin_config[i]; | |
60 | break; | |
61 | } | |
62 | } | |
63 | if (pin1 && i == pin) | |
64 | return 0; | |
65 | ||
66 | /* Check the desired function and channel. */ | |
67 | switch (func) { | |
68 | case PTP_PF_NONE: | |
69 | break; | |
70 | case PTP_PF_EXTTS: | |
71 | if (chan >= info->n_ext_ts) | |
72 | return -EINVAL; | |
73 | break; | |
74 | case PTP_PF_PEROUT: | |
75 | if (chan >= info->n_per_out) | |
76 | return -EINVAL; | |
77 | break; | |
78 | case PTP_PF_PHYSYNC: | |
72df7a72 SS |
79 | if (chan != 0) |
80 | return -EINVAL; | |
9ba8376c | 81 | break; |
6092315d RC |
82 | default: |
83 | return -EINVAL; | |
84 | } | |
85 | ||
6092315d RC |
86 | if (info->verify(info, pin, func, chan)) { |
87 | pr_err("driver cannot use function %u on pin %u\n", func, chan); | |
88 | return -EOPNOTSUPP; | |
89 | } | |
90 | ||
91 | /* Disable whatever function was previously assigned. */ | |
92 | if (pin1) { | |
93 | ptp_disable_pinfunc(info, func, chan); | |
94 | pin1->func = PTP_PF_NONE; | |
95 | pin1->chan = 0; | |
96 | } | |
97 | ptp_disable_pinfunc(info, pin2->func, pin2->chan); | |
98 | pin2->func = func; | |
99 | pin2->chan = chan; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
d94ba80e RC |
104 | int ptp_open(struct posix_clock *pc, fmode_t fmode) |
105 | { | |
106 | return 0; | |
107 | } | |
108 | ||
109 | long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) | |
110 | { | |
d94ba80e | 111 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); |
36180087 | 112 | struct ptp_sys_offset_extended *extoff = NULL; |
fbb960ac ML |
113 | struct ptp_sys_offset_precise precise_offset; |
114 | struct system_device_crosststamp xtstamp; | |
d94ba80e | 115 | struct ptp_clock_info *ops = ptp->info; |
fbb960ac | 116 | struct ptp_sys_offset *sysoff = NULL; |
36180087 | 117 | struct ptp_system_timestamp sts; |
fbb960ac ML |
118 | struct ptp_clock_request req; |
119 | struct ptp_clock_caps caps; | |
215b13dd | 120 | struct ptp_clock_time *pct; |
fbb960ac ML |
121 | unsigned int i, pin_index; |
122 | struct ptp_pin_desc pd; | |
e13cfcb0 | 123 | struct timespec64 ts; |
d94ba80e RC |
124 | int enable, err = 0; |
125 | ||
126 | switch (cmd) { | |
127 | ||
128 | case PTP_CLOCK_GETCAPS: | |
41560658 | 129 | case PTP_CLOCK_GETCAPS2: |
d94ba80e | 130 | memset(&caps, 0, sizeof(caps)); |
41560658 | 131 | |
d94ba80e RC |
132 | caps.max_adj = ptp->info->max_adj; |
133 | caps.n_alarm = ptp->info->n_alarm; | |
134 | caps.n_ext_ts = ptp->info->n_ext_ts; | |
135 | caps.n_per_out = ptp->info->n_per_out; | |
136 | caps.pps = ptp->info->pps; | |
6092315d | 137 | caps.n_pins = ptp->info->n_pins; |
719f1aa4 | 138 | caps.cross_timestamping = ptp->info->getcrosststamp != NULL; |
d3f1cbd2 | 139 | caps.adjust_phase = ptp->info->adjphase != NULL; |
e23ef227 DC |
140 | if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) |
141 | err = -EFAULT; | |
d94ba80e RC |
142 | break; |
143 | ||
144 | case PTP_EXTTS_REQUEST: | |
41560658 FB |
145 | case PTP_EXTTS_REQUEST2: |
146 | memset(&req, 0, sizeof(req)); | |
147 | ||
d94ba80e RC |
148 | if (copy_from_user(&req.extts, (void __user *)arg, |
149 | sizeof(req.extts))) { | |
150 | err = -EFAULT; | |
151 | break; | |
152 | } | |
cd734d54 | 153 | if (cmd == PTP_EXTTS_REQUEST2) { |
6138e687 RC |
154 | /* Tell the drivers to check the flags carefully. */ |
155 | req.extts.flags |= PTP_STRICT_FLAGS; | |
cd734d54 RC |
156 | /* Make sure no reserved bit is set. */ |
157 | if ((req.extts.flags & ~PTP_EXTTS_VALID_FLAGS) || | |
158 | req.extts.rsv[0] || req.extts.rsv[1]) { | |
159 | err = -EINVAL; | |
160 | break; | |
161 | } | |
162 | /* Ensure one of the rising/falling edge bits is set. */ | |
163 | if ((req.extts.flags & PTP_ENABLE_FEATURE) && | |
164 | (req.extts.flags & PTP_EXTTS_EDGES) == 0) { | |
165 | err = -EINVAL; | |
166 | break; | |
167 | } | |
41560658 | 168 | } else if (cmd == PTP_EXTTS_REQUEST) { |
2df4de16 | 169 | req.extts.flags &= PTP_EXTTS_V1_VALID_FLAGS; |
41560658 FB |
170 | req.extts.rsv[0] = 0; |
171 | req.extts.rsv[1] = 0; | |
172 | } | |
d94ba80e RC |
173 | if (req.extts.index >= ops->n_ext_ts) { |
174 | err = -EINVAL; | |
175 | break; | |
176 | } | |
177 | req.type = PTP_CLK_REQ_EXTTS; | |
178 | enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; | |
62582a7e RC |
179 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
180 | return -ERESTARTSYS; | |
d94ba80e | 181 | err = ops->enable(ops, &req, enable); |
62582a7e | 182 | mutex_unlock(&ptp->pincfg_mux); |
d94ba80e RC |
183 | break; |
184 | ||
185 | case PTP_PEROUT_REQUEST: | |
41560658 FB |
186 | case PTP_PEROUT_REQUEST2: |
187 | memset(&req, 0, sizeof(req)); | |
188 | ||
d94ba80e RC |
189 | if (copy_from_user(&req.perout, (void __user *)arg, |
190 | sizeof(req.perout))) { | |
191 | err = -EFAULT; | |
192 | break; | |
193 | } | |
f65b71aa VO |
194 | if (cmd == PTP_PEROUT_REQUEST2) { |
195 | struct ptp_perout_request *perout = &req.perout; | |
196 | ||
197 | if (perout->flags & ~PTP_PEROUT_VALID_FLAGS) { | |
198 | err = -EINVAL; | |
199 | break; | |
200 | } | |
201 | /* | |
202 | * The "on" field has undefined meaning if | |
203 | * PTP_PEROUT_DUTY_CYCLE isn't set, we must still treat | |
204 | * it as reserved, which must be set to zero. | |
205 | */ | |
206 | if (!(perout->flags & PTP_PEROUT_DUTY_CYCLE) && | |
207 | (perout->rsv[0] || perout->rsv[1] || | |
208 | perout->rsv[2] || perout->rsv[3])) { | |
209 | err = -EINVAL; | |
210 | break; | |
211 | } | |
212 | if (perout->flags & PTP_PEROUT_DUTY_CYCLE) { | |
213 | /* The duty cycle must be subunitary. */ | |
214 | if (perout->on.sec > perout->period.sec || | |
215 | (perout->on.sec == perout->period.sec && | |
216 | perout->on.nsec > perout->period.nsec)) { | |
217 | err = -ERANGE; | |
218 | break; | |
219 | } | |
220 | } | |
c29f9aa3 VO |
221 | if (perout->flags & PTP_PEROUT_PHASE) { |
222 | /* | |
223 | * The phase should be specified modulo the | |
224 | * period, therefore anything equal or larger | |
225 | * than 1 period is invalid. | |
226 | */ | |
227 | if (perout->phase.sec > perout->period.sec || | |
228 | (perout->phase.sec == perout->period.sec && | |
229 | perout->phase.nsec >= perout->period.nsec)) { | |
230 | err = -ERANGE; | |
231 | break; | |
232 | } | |
233 | } | |
41560658 | 234 | } else if (cmd == PTP_PEROUT_REQUEST) { |
2df4de16 | 235 | req.perout.flags &= PTP_PEROUT_V1_VALID_FLAGS; |
41560658 FB |
236 | req.perout.rsv[0] = 0; |
237 | req.perout.rsv[1] = 0; | |
238 | req.perout.rsv[2] = 0; | |
239 | req.perout.rsv[3] = 0; | |
240 | } | |
d94ba80e RC |
241 | if (req.perout.index >= ops->n_per_out) { |
242 | err = -EINVAL; | |
243 | break; | |
244 | } | |
245 | req.type = PTP_CLK_REQ_PEROUT; | |
246 | enable = req.perout.period.sec || req.perout.period.nsec; | |
62582a7e RC |
247 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
248 | return -ERESTARTSYS; | |
d94ba80e | 249 | err = ops->enable(ops, &req, enable); |
62582a7e | 250 | mutex_unlock(&ptp->pincfg_mux); |
d94ba80e RC |
251 | break; |
252 | ||
253 | case PTP_ENABLE_PPS: | |
41560658 FB |
254 | case PTP_ENABLE_PPS2: |
255 | memset(&req, 0, sizeof(req)); | |
256 | ||
d94ba80e RC |
257 | if (!capable(CAP_SYS_TIME)) |
258 | return -EPERM; | |
259 | req.type = PTP_CLK_REQ_PPS; | |
260 | enable = arg ? 1 : 0; | |
62582a7e RC |
261 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
262 | return -ERESTARTSYS; | |
d94ba80e | 263 | err = ops->enable(ops, &req, enable); |
62582a7e | 264 | mutex_unlock(&ptp->pincfg_mux); |
d94ba80e RC |
265 | break; |
266 | ||
719f1aa4 | 267 | case PTP_SYS_OFFSET_PRECISE: |
41560658 | 268 | case PTP_SYS_OFFSET_PRECISE2: |
719f1aa4 CH |
269 | if (!ptp->info->getcrosststamp) { |
270 | err = -EOPNOTSUPP; | |
271 | break; | |
272 | } | |
273 | err = ptp->info->getcrosststamp(ptp->info, &xtstamp); | |
274 | if (err) | |
275 | break; | |
276 | ||
02a9079c | 277 | memset(&precise_offset, 0, sizeof(precise_offset)); |
719f1aa4 CH |
278 | ts = ktime_to_timespec64(xtstamp.device); |
279 | precise_offset.device.sec = ts.tv_sec; | |
280 | precise_offset.device.nsec = ts.tv_nsec; | |
281 | ts = ktime_to_timespec64(xtstamp.sys_realtime); | |
282 | precise_offset.sys_realtime.sec = ts.tv_sec; | |
283 | precise_offset.sys_realtime.nsec = ts.tv_nsec; | |
284 | ts = ktime_to_timespec64(xtstamp.sys_monoraw); | |
285 | precise_offset.sys_monoraw.sec = ts.tv_sec; | |
286 | precise_offset.sys_monoraw.nsec = ts.tv_nsec; | |
287 | if (copy_to_user((void __user *)arg, &precise_offset, | |
288 | sizeof(precise_offset))) | |
289 | err = -EFAULT; | |
290 | break; | |
291 | ||
36180087 | 292 | case PTP_SYS_OFFSET_EXTENDED: |
41560658 | 293 | case PTP_SYS_OFFSET_EXTENDED2: |
36180087 ML |
294 | if (!ptp->info->gettimex64) { |
295 | err = -EOPNOTSUPP; | |
296 | break; | |
297 | } | |
298 | extoff = memdup_user((void __user *)arg, sizeof(*extoff)); | |
299 | if (IS_ERR(extoff)) { | |
300 | err = PTR_ERR(extoff); | |
301 | extoff = NULL; | |
302 | break; | |
303 | } | |
895ac137 ES |
304 | if (extoff->n_samples > PTP_MAX_SAMPLES |
305 | || extoff->rsv[0] || extoff->rsv[1] || extoff->rsv[2]) { | |
36180087 ML |
306 | err = -EINVAL; |
307 | break; | |
308 | } | |
309 | for (i = 0; i < extoff->n_samples; i++) { | |
310 | err = ptp->info->gettimex64(ptp->info, &ts, &sts); | |
311 | if (err) | |
312 | goto out; | |
313 | extoff->ts[i][0].sec = sts.pre_ts.tv_sec; | |
314 | extoff->ts[i][0].nsec = sts.pre_ts.tv_nsec; | |
315 | extoff->ts[i][1].sec = ts.tv_sec; | |
316 | extoff->ts[i][1].nsec = ts.tv_nsec; | |
317 | extoff->ts[i][2].sec = sts.post_ts.tv_sec; | |
318 | extoff->ts[i][2].nsec = sts.post_ts.tv_nsec; | |
319 | } | |
320 | if (copy_to_user((void __user *)arg, extoff, sizeof(*extoff))) | |
321 | err = -EFAULT; | |
322 | break; | |
323 | ||
215b13dd | 324 | case PTP_SYS_OFFSET: |
41560658 | 325 | case PTP_SYS_OFFSET2: |
2ece068e MFW |
326 | sysoff = memdup_user((void __user *)arg, sizeof(*sysoff)); |
327 | if (IS_ERR(sysoff)) { | |
328 | err = PTR_ERR(sysoff); | |
6756325a | 329 | sysoff = NULL; |
215b13dd RC |
330 | break; |
331 | } | |
c3484c27 | 332 | if (sysoff->n_samples > PTP_MAX_SAMPLES) { |
215b13dd RC |
333 | err = -EINVAL; |
334 | break; | |
335 | } | |
c3484c27 RC |
336 | pct = &sysoff->ts[0]; |
337 | for (i = 0; i < sysoff->n_samples; i++) { | |
f696a21c | 338 | ktime_get_real_ts64(&ts); |
215b13dd RC |
339 | pct->sec = ts.tv_sec; |
340 | pct->nsec = ts.tv_nsec; | |
341 | pct++; | |
916444df ML |
342 | if (ops->gettimex64) |
343 | err = ops->gettimex64(ops, &ts, NULL); | |
344 | else | |
345 | err = ops->gettime64(ops, &ts); | |
83d0bdc7 ML |
346 | if (err) |
347 | goto out; | |
215b13dd RC |
348 | pct->sec = ts.tv_sec; |
349 | pct->nsec = ts.tv_nsec; | |
350 | pct++; | |
351 | } | |
f696a21c | 352 | ktime_get_real_ts64(&ts); |
215b13dd RC |
353 | pct->sec = ts.tv_sec; |
354 | pct->nsec = ts.tv_nsec; | |
c3484c27 | 355 | if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff))) |
215b13dd RC |
356 | err = -EFAULT; |
357 | break; | |
358 | ||
6092315d | 359 | case PTP_PIN_GETFUNC: |
41560658 | 360 | case PTP_PIN_GETFUNC2: |
6092315d RC |
361 | if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { |
362 | err = -EFAULT; | |
363 | break; | |
364 | } | |
41560658 FB |
365 | if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2] |
366 | || pd.rsv[3] || pd.rsv[4]) | |
367 | && cmd == PTP_PIN_GETFUNC2) { | |
368 | err = -EINVAL; | |
369 | break; | |
370 | } else if (cmd == PTP_PIN_GETFUNC) { | |
371 | pd.rsv[0] = 0; | |
372 | pd.rsv[1] = 0; | |
373 | pd.rsv[2] = 0; | |
374 | pd.rsv[3] = 0; | |
375 | pd.rsv[4] = 0; | |
376 | } | |
6092315d RC |
377 | pin_index = pd.index; |
378 | if (pin_index >= ops->n_pins) { | |
379 | err = -EINVAL; | |
380 | break; | |
381 | } | |
efa61c8c | 382 | pin_index = array_index_nospec(pin_index, ops->n_pins); |
6092315d RC |
383 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
384 | return -ERESTARTSYS; | |
385 | pd = ops->pin_config[pin_index]; | |
386 | mutex_unlock(&ptp->pincfg_mux); | |
387 | if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd))) | |
388 | err = -EFAULT; | |
389 | break; | |
390 | ||
391 | case PTP_PIN_SETFUNC: | |
41560658 | 392 | case PTP_PIN_SETFUNC2: |
6092315d RC |
393 | if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { |
394 | err = -EFAULT; | |
395 | break; | |
396 | } | |
41560658 FB |
397 | if ((pd.rsv[0] || pd.rsv[1] || pd.rsv[2] |
398 | || pd.rsv[3] || pd.rsv[4]) | |
399 | && cmd == PTP_PIN_SETFUNC2) { | |
400 | err = -EINVAL; | |
401 | break; | |
402 | } else if (cmd == PTP_PIN_SETFUNC) { | |
403 | pd.rsv[0] = 0; | |
404 | pd.rsv[1] = 0; | |
405 | pd.rsv[2] = 0; | |
406 | pd.rsv[3] = 0; | |
407 | pd.rsv[4] = 0; | |
408 | } | |
6092315d RC |
409 | pin_index = pd.index; |
410 | if (pin_index >= ops->n_pins) { | |
411 | err = -EINVAL; | |
412 | break; | |
413 | } | |
efa61c8c | 414 | pin_index = array_index_nospec(pin_index, ops->n_pins); |
6092315d RC |
415 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
416 | return -ERESTARTSYS; | |
417 | err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan); | |
418 | mutex_unlock(&ptp->pincfg_mux); | |
419 | break; | |
420 | ||
d94ba80e RC |
421 | default: |
422 | err = -ENOTTY; | |
423 | break; | |
424 | } | |
c3484c27 | 425 | |
83d0bdc7 | 426 | out: |
36180087 | 427 | kfree(extoff); |
c3484c27 | 428 | kfree(sysoff); |
d94ba80e RC |
429 | return err; |
430 | } | |
431 | ||
afc9a42b | 432 | __poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) |
d94ba80e RC |
433 | { |
434 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
435 | ||
436 | poll_wait(fp, &ptp->tsev_wq, wait); | |
437 | ||
a9a08845 | 438 | return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0; |
d94ba80e RC |
439 | } |
440 | ||
c7ec0bad RC |
441 | #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event)) |
442 | ||
d94ba80e RC |
443 | ssize_t ptp_read(struct posix_clock *pc, |
444 | uint rdflags, char __user *buf, size_t cnt) | |
445 | { | |
446 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
447 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
c7ec0bad | 448 | struct ptp_extts_event *event; |
d94ba80e RC |
449 | unsigned long flags; |
450 | size_t qcnt, i; | |
c7ec0bad | 451 | int result; |
d94ba80e RC |
452 | |
453 | if (cnt % sizeof(struct ptp_extts_event) != 0) | |
454 | return -EINVAL; | |
455 | ||
c7ec0bad RC |
456 | if (cnt > EXTTS_BUFSIZE) |
457 | cnt = EXTTS_BUFSIZE; | |
d94ba80e RC |
458 | |
459 | cnt = cnt / sizeof(struct ptp_extts_event); | |
460 | ||
461 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
462 | return -ERESTARTSYS; | |
463 | ||
464 | if (wait_event_interruptible(ptp->tsev_wq, | |
465 | ptp->defunct || queue_cnt(queue))) { | |
466 | mutex_unlock(&ptp->tsevq_mux); | |
467 | return -ERESTARTSYS; | |
468 | } | |
469 | ||
fb5a18cf DC |
470 | if (ptp->defunct) { |
471 | mutex_unlock(&ptp->tsevq_mux); | |
d94ba80e | 472 | return -ENODEV; |
fb5a18cf | 473 | } |
d94ba80e | 474 | |
c7ec0bad RC |
475 | event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL); |
476 | if (!event) { | |
477 | mutex_unlock(&ptp->tsevq_mux); | |
478 | return -ENOMEM; | |
479 | } | |
480 | ||
d94ba80e RC |
481 | spin_lock_irqsave(&queue->lock, flags); |
482 | ||
483 | qcnt = queue_cnt(queue); | |
484 | ||
485 | if (cnt > qcnt) | |
486 | cnt = qcnt; | |
487 | ||
488 | for (i = 0; i < cnt; i++) { | |
489 | event[i] = queue->buf[queue->head]; | |
490 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
491 | } | |
492 | ||
493 | spin_unlock_irqrestore(&queue->lock, flags); | |
494 | ||
495 | cnt = cnt * sizeof(struct ptp_extts_event); | |
496 | ||
497 | mutex_unlock(&ptp->tsevq_mux); | |
498 | ||
c7ec0bad | 499 | result = cnt; |
fb5a18cf | 500 | if (copy_to_user(buf, event, cnt)) |
c7ec0bad | 501 | result = -EFAULT; |
d94ba80e | 502 | |
c7ec0bad RC |
503 | kfree(event); |
504 | return result; | |
d94ba80e | 505 | } |