Commit | Line | Data |
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35728b82 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ff3ead96 JS |
2 | /* |
3 | * Alarmtimer interface | |
4 | * | |
4bf07f65 | 5 | * This interface provides a timer which is similar to hrtimers, |
ff3ead96 JS |
6 | * but triggers a RTC alarm if the box is suspend. |
7 | * | |
8 | * This interface is influenced by the Android RTC Alarm timer | |
9 | * interface. | |
10 | * | |
4bf07f65 | 11 | * Copyright (C) 2010 IBM Corporation |
ff3ead96 JS |
12 | * |
13 | * Author: John Stultz <john.stultz@linaro.org> | |
ff3ead96 JS |
14 | */ |
15 | #include <linux/time.h> | |
16 | #include <linux/hrtimer.h> | |
17 | #include <linux/timerqueue.h> | |
18 | #include <linux/rtc.h> | |
174cd4b1 | 19 | #include <linux/sched/signal.h> |
b17b0153 | 20 | #include <linux/sched/debug.h> |
ff3ead96 JS |
21 | #include <linux/alarmtimer.h> |
22 | #include <linux/mutex.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/posix-timers.h> | |
25 | #include <linux/workqueue.h> | |
26 | #include <linux/freezer.h> | |
edbeda46 | 27 | #include <linux/compat.h> |
51218298 | 28 | #include <linux/module.h> |
5a590f35 | 29 | #include <linux/time_namespace.h> |
ff3ead96 | 30 | |
bab0aae9 TG |
31 | #include "posix-timers.h" |
32 | ||
4a057549 BW |
33 | #define CREATE_TRACE_POINTS |
34 | #include <trace/events/alarmtimer.h> | |
35 | ||
180bf812 JS |
36 | /** |
37 | * struct alarm_base - Alarm timer bases | |
38 | * @lock: Lock for syncrhonized access to the base | |
39 | * @timerqueue: Timerqueue head managing the list of events | |
41b3b8df | 40 | * @get_ktime: Function to read the time correlating to the base |
2f58bf90 | 41 | * @get_timespec: Function to read the namespace time correlating to the base |
180bf812 | 42 | * @base_clockid: clockid for the base |
180bf812 | 43 | */ |
ff3ead96 JS |
44 | static struct alarm_base { |
45 | spinlock_t lock; | |
46 | struct timerqueue_head timerqueue; | |
41b3b8df | 47 | ktime_t (*get_ktime)(void); |
2f58bf90 | 48 | void (*get_timespec)(struct timespec64 *tp); |
ff3ead96 | 49 | clockid_t base_clockid; |
ff3ead96 JS |
50 | } alarm_bases[ALARM_NUMTYPE]; |
51 | ||
b6b3b80f | 52 | #if defined(CONFIG_POSIX_TIMERS) || defined(CONFIG_RTC_CLASS) |
4a057549 BW |
53 | /* freezer information to handle clock_nanosleep triggered wakeups */ |
54 | static enum alarmtimer_type freezer_alarmtype; | |
55 | static ktime_t freezer_expires; | |
c008ba58 JS |
56 | static ktime_t freezer_delta; |
57 | static DEFINE_SPINLOCK(freezer_delta_lock); | |
b6b3b80f | 58 | #endif |
c008ba58 | 59 | |
47b4a457 | 60 | #ifdef CONFIG_RTC_CLASS |
180bf812 | 61 | /* rtc timer and device for setting alarm wakeups at suspend */ |
c5e14e76 | 62 | static struct rtc_timer rtctimer; |
ff3ead96 | 63 | static struct rtc_device *rtcdev; |
c008ba58 | 64 | static DEFINE_SPINLOCK(rtcdev_lock); |
ff3ead96 | 65 | |
c008ba58 JS |
66 | /** |
67 | * alarmtimer_get_rtcdev - Return selected rtcdevice | |
68 | * | |
69 | * This function returns the rtc device to use for wakealarms. | |
c008ba58 | 70 | */ |
57c498fa | 71 | struct rtc_device *alarmtimer_get_rtcdev(void) |
c008ba58 | 72 | { |
c008ba58 JS |
73 | unsigned long flags; |
74 | struct rtc_device *ret; | |
75 | ||
76 | spin_lock_irqsave(&rtcdev_lock, flags); | |
c008ba58 JS |
77 | ret = rtcdev; |
78 | spin_unlock_irqrestore(&rtcdev_lock, flags); | |
79 | ||
80 | return ret; | |
81 | } | |
71d5d2b7 | 82 | EXPORT_SYMBOL_GPL(alarmtimer_get_rtcdev); |
8bc0dafb | 83 | |
2243acd5 | 84 | static int alarmtimer_rtc_add_device(struct device *dev) |
8bc0dafb JS |
85 | { |
86 | unsigned long flags; | |
87 | struct rtc_device *rtc = to_rtc_device(dev); | |
c79108bd | 88 | struct platform_device *pdev; |
6b6d188a | 89 | int ret = 0; |
8bc0dafb JS |
90 | |
91 | if (rtcdev) | |
92 | return -EBUSY; | |
93 | ||
e09784a8 | 94 | if (!test_bit(RTC_FEATURE_ALARM, rtc->features)) |
8bc0dafb JS |
95 | return -1; |
96 | if (!device_may_wakeup(rtc->dev.parent)) | |
97 | return -1; | |
98 | ||
c79108bd SB |
99 | pdev = platform_device_register_data(dev, "alarmtimer", |
100 | PLATFORM_DEVID_AUTO, NULL, 0); | |
7c94caca SB |
101 | if (!IS_ERR(pdev)) |
102 | device_init_wakeup(&pdev->dev, true); | |
47b4a457 | 103 | |
8bc0dafb | 104 | spin_lock_irqsave(&rtcdev_lock, flags); |
7c94caca | 105 | if (!IS_ERR(pdev) && !rtcdev) { |
51218298 | 106 | if (!try_module_get(rtc->owner)) { |
6b6d188a SB |
107 | ret = -1; |
108 | goto unlock; | |
51218298 AB |
109 | } |
110 | ||
8bc0dafb JS |
111 | rtcdev = rtc; |
112 | /* hold a reference so it doesn't go away */ | |
113 | get_device(dev); | |
c79108bd SB |
114 | pdev = NULL; |
115 | } else { | |
116 | ret = -1; | |
8bc0dafb | 117 | } |
6b6d188a | 118 | unlock: |
8bc0dafb | 119 | spin_unlock_irqrestore(&rtcdev_lock, flags); |
47b4a457 | 120 | |
c79108bd | 121 | platform_device_unregister(pdev); |
47b4a457 | 122 | |
6b6d188a | 123 | return ret; |
8bc0dafb JS |
124 | } |
125 | ||
c5e14e76 TG |
126 | static inline void alarmtimer_rtc_timer_init(void) |
127 | { | |
128 | rtc_timer_init(&rtctimer, NULL, NULL); | |
129 | } | |
130 | ||
8bc0dafb JS |
131 | static struct class_interface alarmtimer_rtc_interface = { |
132 | .add_dev = &alarmtimer_rtc_add_device, | |
133 | }; | |
134 | ||
4523f6ad | 135 | static int alarmtimer_rtc_interface_setup(void) |
8bc0dafb JS |
136 | { |
137 | alarmtimer_rtc_interface.class = rtc_class; | |
4523f6ad TG |
138 | return class_interface_register(&alarmtimer_rtc_interface); |
139 | } | |
140 | static void alarmtimer_rtc_interface_remove(void) | |
141 | { | |
142 | class_interface_unregister(&alarmtimer_rtc_interface); | |
8bc0dafb | 143 | } |
1c6b39ad | 144 | #else |
4523f6ad TG |
145 | static inline int alarmtimer_rtc_interface_setup(void) { return 0; } |
146 | static inline void alarmtimer_rtc_interface_remove(void) { } | |
c5e14e76 | 147 | static inline void alarmtimer_rtc_timer_init(void) { } |
c008ba58 | 148 | #endif |
ff3ead96 | 149 | |
180bf812 | 150 | /** |
ff3ead96 JS |
151 | * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue |
152 | * @base: pointer to the base where the timer is being run | |
153 | * @alarm: pointer to alarm being enqueued. | |
154 | * | |
dae373be | 155 | * Adds alarm to a alarm_base timerqueue |
ff3ead96 JS |
156 | * |
157 | * Must hold base->lock when calling. | |
158 | */ | |
159 | static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm) | |
160 | { | |
dae373be JS |
161 | if (alarm->state & ALARMTIMER_STATE_ENQUEUED) |
162 | timerqueue_del(&base->timerqueue, &alarm->node); | |
163 | ||
ff3ead96 | 164 | timerqueue_add(&base->timerqueue, &alarm->node); |
a28cde81 | 165 | alarm->state |= ALARMTIMER_STATE_ENQUEUED; |
ff3ead96 JS |
166 | } |
167 | ||
180bf812 | 168 | /** |
a65bcc12 | 169 | * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue |
ff3ead96 JS |
170 | * @base: pointer to the base where the timer is running |
171 | * @alarm: pointer to alarm being removed | |
172 | * | |
dae373be | 173 | * Removes alarm to a alarm_base timerqueue |
ff3ead96 JS |
174 | * |
175 | * Must hold base->lock when calling. | |
176 | */ | |
a65bcc12 | 177 | static void alarmtimer_dequeue(struct alarm_base *base, struct alarm *alarm) |
ff3ead96 | 178 | { |
a28cde81 JS |
179 | if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED)) |
180 | return; | |
181 | ||
ff3ead96 | 182 | timerqueue_del(&base->timerqueue, &alarm->node); |
a28cde81 | 183 | alarm->state &= ~ALARMTIMER_STATE_ENQUEUED; |
ff3ead96 JS |
184 | } |
185 | ||
7068b7a1 | 186 | |
180bf812 | 187 | /** |
7068b7a1 JS |
188 | * alarmtimer_fired - Handles alarm hrtimer being fired. |
189 | * @timer: pointer to hrtimer being run | |
ff3ead96 | 190 | * |
180bf812 JS |
191 | * When a alarm timer fires, this runs through the timerqueue to |
192 | * see which alarms expired, and runs those. If there are more alarm | |
193 | * timers queued for the future, we set the hrtimer to fire when | |
b0294f30 | 194 | * the next future alarm timer expires. |
ff3ead96 | 195 | */ |
7068b7a1 | 196 | static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer) |
ff3ead96 | 197 | { |
dae373be JS |
198 | struct alarm *alarm = container_of(timer, struct alarm, timer); |
199 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
ff3ead96 | 200 | unsigned long flags; |
7068b7a1 | 201 | int ret = HRTIMER_NORESTART; |
54da23b7 | 202 | int restart = ALARMTIMER_NORESTART; |
ff3ead96 JS |
203 | |
204 | spin_lock_irqsave(&base->lock, flags); | |
a65bcc12 | 205 | alarmtimer_dequeue(base, alarm); |
dae373be | 206 | spin_unlock_irqrestore(&base->lock, flags); |
54da23b7 | 207 | |
dae373be | 208 | if (alarm->function) |
41b3b8df | 209 | restart = alarm->function(alarm, base->get_ktime()); |
ff3ead96 | 210 | |
dae373be JS |
211 | spin_lock_irqsave(&base->lock, flags); |
212 | if (restart != ALARMTIMER_NORESTART) { | |
213 | hrtimer_set_expires(&alarm->timer, alarm->node.expires); | |
214 | alarmtimer_enqueue(base, alarm); | |
7068b7a1 | 215 | ret = HRTIMER_RESTART; |
ff3ead96 JS |
216 | } |
217 | spin_unlock_irqrestore(&base->lock, flags); | |
ff3ead96 | 218 | |
41b3b8df | 219 | trace_alarmtimer_fired(alarm, base->get_ktime()); |
7068b7a1 | 220 | return ret; |
ff3ead96 | 221 | |
ff3ead96 JS |
222 | } |
223 | ||
6cffe00f TP |
224 | ktime_t alarm_expires_remaining(const struct alarm *alarm) |
225 | { | |
226 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
41b3b8df | 227 | return ktime_sub(alarm->node.expires, base->get_ktime()); |
6cffe00f | 228 | } |
11682a41 | 229 | EXPORT_SYMBOL_GPL(alarm_expires_remaining); |
6cffe00f | 230 | |
472647dc | 231 | #ifdef CONFIG_RTC_CLASS |
180bf812 | 232 | /** |
ff3ead96 JS |
233 | * alarmtimer_suspend - Suspend time callback |
234 | * @dev: unused | |
ff3ead96 JS |
235 | * |
236 | * When we are going into suspend, we look through the bases | |
237 | * to see which is the soonest timer to expire. We then | |
238 | * set an rtc timer to fire that far into the future, which | |
239 | * will wake us from suspend. | |
240 | */ | |
241 | static int alarmtimer_suspend(struct device *dev) | |
242 | { | |
4a057549 BW |
243 | ktime_t min, now, expires; |
244 | int i, ret, type; | |
c008ba58 | 245 | struct rtc_device *rtc; |
4a057549 BW |
246 | unsigned long flags; |
247 | struct rtc_time tm; | |
ff3ead96 JS |
248 | |
249 | spin_lock_irqsave(&freezer_delta_lock, flags); | |
250 | min = freezer_delta; | |
4a057549 BW |
251 | expires = freezer_expires; |
252 | type = freezer_alarmtype; | |
8b0e1953 | 253 | freezer_delta = 0; |
ff3ead96 JS |
254 | spin_unlock_irqrestore(&freezer_delta_lock, flags); |
255 | ||
8bc0dafb | 256 | rtc = alarmtimer_get_rtcdev(); |
ff3ead96 | 257 | /* If we have no rtcdev, just return */ |
c008ba58 | 258 | if (!rtc) |
ff3ead96 JS |
259 | return 0; |
260 | ||
261 | /* Find the soonest timer to expire*/ | |
262 | for (i = 0; i < ALARM_NUMTYPE; i++) { | |
263 | struct alarm_base *base = &alarm_bases[i]; | |
264 | struct timerqueue_node *next; | |
265 | ktime_t delta; | |
266 | ||
267 | spin_lock_irqsave(&base->lock, flags); | |
268 | next = timerqueue_getnext(&base->timerqueue); | |
269 | spin_unlock_irqrestore(&base->lock, flags); | |
270 | if (!next) | |
271 | continue; | |
41b3b8df | 272 | delta = ktime_sub(next->expires, base->get_ktime()); |
2456e855 | 273 | if (!min || (delta < min)) { |
4a057549 | 274 | expires = next->expires; |
ff3ead96 | 275 | min = delta; |
4a057549 BW |
276 | type = i; |
277 | } | |
ff3ead96 | 278 | } |
2456e855 | 279 | if (min == 0) |
ff3ead96 JS |
280 | return 0; |
281 | ||
59a93c27 | 282 | if (ktime_to_ns(min) < 2 * NSEC_PER_SEC) { |
7c94caca | 283 | pm_wakeup_event(dev, 2 * MSEC_PER_SEC); |
59a93c27 TP |
284 | return -EBUSY; |
285 | } | |
ff3ead96 | 286 | |
4a057549 BW |
287 | trace_alarmtimer_suspend(expires, type); |
288 | ||
ff3ead96 | 289 | /* Setup an rtc timer to fire that far in the future */ |
c008ba58 JS |
290 | rtc_timer_cancel(rtc, &rtctimer); |
291 | rtc_read_time(rtc, &tm); | |
ff3ead96 JS |
292 | now = rtc_tm_to_ktime(tm); |
293 | now = ktime_add(now, min); | |
294 | ||
59a93c27 | 295 | /* Set alarm, if in the past reject suspend briefly to handle */ |
8b0e1953 | 296 | ret = rtc_timer_start(rtc, &rtctimer, now, 0); |
59a93c27 | 297 | if (ret < 0) |
7c94caca | 298 | pm_wakeup_event(dev, MSEC_PER_SEC); |
59a93c27 | 299 | return ret; |
ff3ead96 | 300 | } |
a0e3213f | 301 | |
302 | static int alarmtimer_resume(struct device *dev) | |
303 | { | |
304 | struct rtc_device *rtc; | |
305 | ||
306 | rtc = alarmtimer_get_rtcdev(); | |
307 | if (rtc) | |
308 | rtc_timer_cancel(rtc, &rtctimer); | |
309 | return 0; | |
310 | } | |
311 | ||
472647dc JS |
312 | #else |
313 | static int alarmtimer_suspend(struct device *dev) | |
314 | { | |
315 | return 0; | |
316 | } | |
a0e3213f | 317 | |
318 | static int alarmtimer_resume(struct device *dev) | |
319 | { | |
320 | return 0; | |
321 | } | |
472647dc | 322 | #endif |
ff3ead96 | 323 | |
bd031430 TG |
324 | static void |
325 | __alarm_init(struct alarm *alarm, enum alarmtimer_type type, | |
326 | enum alarmtimer_restart (*function)(struct alarm *, ktime_t)) | |
327 | { | |
328 | timerqueue_init(&alarm->node); | |
329 | alarm->timer.function = alarmtimer_fired; | |
330 | alarm->function = function; | |
331 | alarm->type = type; | |
332 | alarm->state = ALARMTIMER_STATE_INACTIVE; | |
333 | } | |
334 | ||
180bf812 | 335 | /** |
ff3ead96 JS |
336 | * alarm_init - Initialize an alarm structure |
337 | * @alarm: ptr to alarm to be initialized | |
338 | * @type: the type of the alarm | |
339 | * @function: callback that is run when the alarm fires | |
ff3ead96 JS |
340 | */ |
341 | void alarm_init(struct alarm *alarm, enum alarmtimer_type type, | |
4b41308d | 342 | enum alarmtimer_restart (*function)(struct alarm *, ktime_t)) |
ff3ead96 | 343 | { |
dae373be | 344 | hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid, |
bd031430 TG |
345 | HRTIMER_MODE_ABS); |
346 | __alarm_init(alarm, type, function); | |
ff3ead96 | 347 | } |
11682a41 | 348 | EXPORT_SYMBOL_GPL(alarm_init); |
ff3ead96 | 349 | |
180bf812 | 350 | /** |
6cffe00f | 351 | * alarm_start - Sets an absolute alarm to fire |
ff3ead96 JS |
352 | * @alarm: ptr to alarm to set |
353 | * @start: time to run the alarm | |
ff3ead96 | 354 | */ |
b193217e | 355 | void alarm_start(struct alarm *alarm, ktime_t start) |
ff3ead96 JS |
356 | { |
357 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
358 | unsigned long flags; | |
359 | ||
360 | spin_lock_irqsave(&base->lock, flags); | |
ff3ead96 | 361 | alarm->node.expires = start; |
ff3ead96 | 362 | alarmtimer_enqueue(base, alarm); |
b193217e | 363 | hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS); |
ff3ead96 | 364 | spin_unlock_irqrestore(&base->lock, flags); |
4a057549 | 365 | |
41b3b8df | 366 | trace_alarmtimer_start(alarm, base->get_ktime()); |
ff3ead96 | 367 | } |
11682a41 | 368 | EXPORT_SYMBOL_GPL(alarm_start); |
ff3ead96 | 369 | |
6cffe00f TP |
370 | /** |
371 | * alarm_start_relative - Sets a relative alarm to fire | |
372 | * @alarm: ptr to alarm to set | |
373 | * @start: time relative to now to run the alarm | |
374 | */ | |
b193217e | 375 | void alarm_start_relative(struct alarm *alarm, ktime_t start) |
6cffe00f TP |
376 | { |
377 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
378 | ||
41b3b8df | 379 | start = ktime_add_safe(start, base->get_ktime()); |
b193217e | 380 | alarm_start(alarm, start); |
6cffe00f | 381 | } |
11682a41 | 382 | EXPORT_SYMBOL_GPL(alarm_start_relative); |
6cffe00f TP |
383 | |
384 | void alarm_restart(struct alarm *alarm) | |
385 | { | |
386 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
387 | unsigned long flags; | |
388 | ||
389 | spin_lock_irqsave(&base->lock, flags); | |
390 | hrtimer_set_expires(&alarm->timer, alarm->node.expires); | |
391 | hrtimer_restart(&alarm->timer); | |
392 | alarmtimer_enqueue(base, alarm); | |
393 | spin_unlock_irqrestore(&base->lock, flags); | |
394 | } | |
11682a41 | 395 | EXPORT_SYMBOL_GPL(alarm_restart); |
6cffe00f | 396 | |
180bf812 | 397 | /** |
9082c465 | 398 | * alarm_try_to_cancel - Tries to cancel an alarm timer |
ff3ead96 | 399 | * @alarm: ptr to alarm to be canceled |
9082c465 JS |
400 | * |
401 | * Returns 1 if the timer was canceled, 0 if it was not running, | |
402 | * and -1 if the callback was running | |
ff3ead96 | 403 | */ |
9082c465 | 404 | int alarm_try_to_cancel(struct alarm *alarm) |
ff3ead96 JS |
405 | { |
406 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
407 | unsigned long flags; | |
dae373be | 408 | int ret; |
9082c465 | 409 | |
dae373be JS |
410 | spin_lock_irqsave(&base->lock, flags); |
411 | ret = hrtimer_try_to_cancel(&alarm->timer); | |
412 | if (ret >= 0) | |
a65bcc12 | 413 | alarmtimer_dequeue(base, alarm); |
ff3ead96 | 414 | spin_unlock_irqrestore(&base->lock, flags); |
4a057549 | 415 | |
41b3b8df | 416 | trace_alarmtimer_cancel(alarm, base->get_ktime()); |
9082c465 | 417 | return ret; |
ff3ead96 | 418 | } |
11682a41 | 419 | EXPORT_SYMBOL_GPL(alarm_try_to_cancel); |
ff3ead96 JS |
420 | |
421 | ||
9082c465 JS |
422 | /** |
423 | * alarm_cancel - Spins trying to cancel an alarm timer until it is done | |
424 | * @alarm: ptr to alarm to be canceled | |
425 | * | |
426 | * Returns 1 if the timer was canceled, 0 if it was not active. | |
427 | */ | |
428 | int alarm_cancel(struct alarm *alarm) | |
429 | { | |
430 | for (;;) { | |
431 | int ret = alarm_try_to_cancel(alarm); | |
432 | if (ret >= 0) | |
433 | return ret; | |
51ae3309 | 434 | hrtimer_cancel_wait_running(&alarm->timer); |
9082c465 JS |
435 | } |
436 | } | |
11682a41 | 437 | EXPORT_SYMBOL_GPL(alarm_cancel); |
9082c465 | 438 | |
dce75a8c JS |
439 | |
440 | u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval) | |
441 | { | |
442 | u64 overrun = 1; | |
443 | ktime_t delta; | |
444 | ||
445 | delta = ktime_sub(now, alarm->node.expires); | |
446 | ||
2456e855 | 447 | if (delta < 0) |
dce75a8c JS |
448 | return 0; |
449 | ||
2456e855 | 450 | if (unlikely(delta >= interval)) { |
dce75a8c JS |
451 | s64 incr = ktime_to_ns(interval); |
452 | ||
453 | overrun = ktime_divns(delta, incr); | |
454 | ||
455 | alarm->node.expires = ktime_add_ns(alarm->node.expires, | |
456 | incr*overrun); | |
457 | ||
2456e855 | 458 | if (alarm->node.expires > now) |
dce75a8c JS |
459 | return overrun; |
460 | /* | |
461 | * This (and the ktime_add() below) is the | |
462 | * correction for exact: | |
463 | */ | |
464 | overrun++; | |
465 | } | |
466 | ||
f4781e76 | 467 | alarm->node.expires = ktime_add_safe(alarm->node.expires, interval); |
dce75a8c JS |
468 | return overrun; |
469 | } | |
11682a41 | 470 | EXPORT_SYMBOL_GPL(alarm_forward); |
dce75a8c | 471 | |
d125d134 | 472 | static u64 __alarm_forward_now(struct alarm *alarm, ktime_t interval, bool throttle) |
6cffe00f TP |
473 | { |
474 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
d125d134 TG |
475 | ktime_t now = base->get_ktime(); |
476 | ||
477 | if (IS_ENABLED(CONFIG_HIGH_RES_TIMERS) && throttle) { | |
478 | /* | |
479 | * Same issue as with posix_timer_fn(). Timers which are | |
480 | * periodic but the signal is ignored can starve the system | |
481 | * with a very small interval. The real fix which was | |
482 | * promised in the context of posix_timer_fn() never | |
483 | * materialized, but someone should really work on it. | |
484 | * | |
485 | * To prevent DOS fake @now to be 1 jiffie out which keeps | |
486 | * the overrun accounting correct but creates an | |
487 | * inconsistency vs. timer_gettime(2). | |
488 | */ | |
489 | ktime_t kj = NSEC_PER_SEC / HZ; | |
490 | ||
491 | if (interval < kj) | |
492 | now = ktime_add(now, kj); | |
493 | } | |
494 | ||
495 | return alarm_forward(alarm, now, interval); | |
496 | } | |
6cffe00f | 497 | |
d125d134 TG |
498 | u64 alarm_forward_now(struct alarm *alarm, ktime_t interval) |
499 | { | |
500 | return __alarm_forward_now(alarm, interval, false); | |
6cffe00f | 501 | } |
11682a41 | 502 | EXPORT_SYMBOL_GPL(alarm_forward_now); |
dce75a8c | 503 | |
d3ba5a9a CH |
504 | #ifdef CONFIG_POSIX_TIMERS |
505 | ||
506 | static void alarmtimer_freezerset(ktime_t absexp, enum alarmtimer_type type) | |
507 | { | |
508 | struct alarm_base *base; | |
509 | unsigned long flags; | |
510 | ktime_t delta; | |
511 | ||
512 | switch(type) { | |
513 | case ALARM_REALTIME: | |
514 | base = &alarm_bases[ALARM_REALTIME]; | |
515 | type = ALARM_REALTIME_FREEZER; | |
516 | break; | |
517 | case ALARM_BOOTTIME: | |
518 | base = &alarm_bases[ALARM_BOOTTIME]; | |
519 | type = ALARM_BOOTTIME_FREEZER; | |
520 | break; | |
521 | default: | |
522 | WARN_ONCE(1, "Invalid alarm type: %d\n", type); | |
523 | return; | |
524 | } | |
525 | ||
41b3b8df | 526 | delta = ktime_sub(absexp, base->get_ktime()); |
d3ba5a9a CH |
527 | |
528 | spin_lock_irqsave(&freezer_delta_lock, flags); | |
529 | if (!freezer_delta || (delta < freezer_delta)) { | |
530 | freezer_delta = delta; | |
531 | freezer_expires = absexp; | |
532 | freezer_alarmtype = type; | |
533 | } | |
534 | spin_unlock_irqrestore(&freezer_delta_lock, flags); | |
535 | } | |
dce75a8c | 536 | |
180bf812 | 537 | /** |
9a7adcf5 JS |
538 | * clock2alarm - helper that converts from clockid to alarmtypes |
539 | * @clockid: clockid. | |
9a7adcf5 JS |
540 | */ |
541 | static enum alarmtimer_type clock2alarm(clockid_t clockid) | |
542 | { | |
543 | if (clockid == CLOCK_REALTIME_ALARM) | |
544 | return ALARM_REALTIME; | |
545 | if (clockid == CLOCK_BOOTTIME_ALARM) | |
546 | return ALARM_BOOTTIME; | |
547 | return -1; | |
548 | } | |
549 | ||
180bf812 | 550 | /** |
9a7adcf5 JS |
551 | * alarm_handle_timer - Callback for posix timers |
552 | * @alarm: alarm that fired | |
b5c28ea6 | 553 | * @now: time at the timer expiration |
9a7adcf5 JS |
554 | * |
555 | * Posix timer callback for expired alarm timers. | |
b5c28ea6 AB |
556 | * |
557 | * Return: whether the timer is to be restarted | |
9a7adcf5 | 558 | */ |
4b41308d JS |
559 | static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm, |
560 | ktime_t now) | |
9a7adcf5 JS |
561 | { |
562 | struct k_itimer *ptr = container_of(alarm, struct k_itimer, | |
f2c45807 | 563 | it.alarm.alarmtimer); |
474e941b | 564 | enum alarmtimer_restart result = ALARMTIMER_NORESTART; |
f2c45807 TG |
565 | unsigned long flags; |
566 | int si_private = 0; | |
474e941b RL |
567 | |
568 | spin_lock_irqsave(&ptr->it_lock, flags); | |
4b41308d | 569 | |
f2c45807 TG |
570 | ptr->it_active = 0; |
571 | if (ptr->it_interval) | |
572 | si_private = ++ptr->it_requeue_pending; | |
573 | ||
574 | if (posix_timer_event(ptr, si_private) && ptr->it_interval) { | |
575 | /* | |
576 | * Handle ignored signals and rearm the timer. This will go | |
d125d134 TG |
577 | * away once we handle ignored signals proper. Ensure that |
578 | * small intervals cannot starve the system. | |
f2c45807 | 579 | */ |
d125d134 | 580 | ptr->it_overrun += __alarm_forward_now(alarm, ptr->it_interval, true); |
f2c45807 TG |
581 | ++ptr->it_requeue_pending; |
582 | ptr->it_active = 1; | |
474e941b | 583 | result = ALARMTIMER_RESTART; |
54da23b7 | 584 | } |
474e941b RL |
585 | spin_unlock_irqrestore(&ptr->it_lock, flags); |
586 | ||
587 | return result; | |
9a7adcf5 JS |
588 | } |
589 | ||
b3db80f7 TG |
590 | /** |
591 | * alarm_timer_rearm - Posix timer callback for rearming timer | |
592 | * @timr: Pointer to the posixtimer data struct | |
593 | */ | |
594 | static void alarm_timer_rearm(struct k_itimer *timr) | |
595 | { | |
596 | struct alarm *alarm = &timr->it.alarm.alarmtimer; | |
597 | ||
598 | timr->it_overrun += alarm_forward_now(alarm, timr->it_interval); | |
599 | alarm_start(alarm, alarm->node.expires); | |
600 | } | |
601 | ||
e7561f16 TG |
602 | /** |
603 | * alarm_timer_forward - Posix timer callback for forwarding timer | |
604 | * @timr: Pointer to the posixtimer data struct | |
605 | * @now: Current time to forward the timer against | |
606 | */ | |
6fec64e1 | 607 | static s64 alarm_timer_forward(struct k_itimer *timr, ktime_t now) |
e7561f16 TG |
608 | { |
609 | struct alarm *alarm = &timr->it.alarm.alarmtimer; | |
610 | ||
6fec64e1 | 611 | return alarm_forward(alarm, timr->it_interval, now); |
e7561f16 TG |
612 | } |
613 | ||
d653d845 TG |
614 | /** |
615 | * alarm_timer_remaining - Posix timer callback to retrieve remaining time | |
616 | * @timr: Pointer to the posixtimer data struct | |
617 | * @now: Current time to calculate against | |
618 | */ | |
619 | static ktime_t alarm_timer_remaining(struct k_itimer *timr, ktime_t now) | |
620 | { | |
621 | struct alarm *alarm = &timr->it.alarm.alarmtimer; | |
622 | ||
07d7e120 | 623 | return ktime_sub(alarm->node.expires, now); |
d653d845 TG |
624 | } |
625 | ||
e344c9e7 TG |
626 | /** |
627 | * alarm_timer_try_to_cancel - Posix timer callback to cancel a timer | |
628 | * @timr: Pointer to the posixtimer data struct | |
629 | */ | |
630 | static int alarm_timer_try_to_cancel(struct k_itimer *timr) | |
631 | { | |
632 | return alarm_try_to_cancel(&timr->it.alarm.alarmtimer); | |
633 | } | |
634 | ||
ec8f954a TG |
635 | /** |
636 | * alarm_timer_wait_running - Posix timer callback to wait for a timer | |
637 | * @timr: Pointer to the posixtimer data struct | |
638 | * | |
639 | * Called from the core code when timer cancel detected that the callback | |
640 | * is running. @timr is unlocked and rcu read lock is held to prevent it | |
641 | * from being freed. | |
642 | */ | |
643 | static void alarm_timer_wait_running(struct k_itimer *timr) | |
644 | { | |
645 | hrtimer_cancel_wait_running(&timr->it.alarm.alarmtimer.timer); | |
646 | } | |
647 | ||
b3bf6f36 TG |
648 | /** |
649 | * alarm_timer_arm - Posix timer callback to arm a timer | |
650 | * @timr: Pointer to the posixtimer data struct | |
651 | * @expires: The new expiry time | |
652 | * @absolute: Expiry value is absolute time | |
653 | * @sigev_none: Posix timer does not deliver signals | |
654 | */ | |
655 | static void alarm_timer_arm(struct k_itimer *timr, ktime_t expires, | |
656 | bool absolute, bool sigev_none) | |
657 | { | |
658 | struct alarm *alarm = &timr->it.alarm.alarmtimer; | |
659 | struct alarm_base *base = &alarm_bases[alarm->type]; | |
660 | ||
661 | if (!absolute) | |
41b3b8df | 662 | expires = ktime_add_safe(expires, base->get_ktime()); |
b3bf6f36 TG |
663 | if (sigev_none) |
664 | alarm->node.expires = expires; | |
665 | else | |
666 | alarm_start(&timr->it.alarm.alarmtimer, expires); | |
667 | } | |
668 | ||
180bf812 | 669 | /** |
9a7adcf5 JS |
670 | * alarm_clock_getres - posix getres interface |
671 | * @which_clock: clockid | |
672 | * @tp: timespec to fill | |
673 | * | |
674 | * Returns the granularity of underlying alarm base clock | |
675 | */ | |
d2e3e0ca | 676 | static int alarm_clock_getres(const clockid_t which_clock, struct timespec64 *tp) |
9a7adcf5 | 677 | { |
1c6b39ad | 678 | if (!alarmtimer_get_rtcdev()) |
98d6f4dd | 679 | return -EINVAL; |
1c6b39ad | 680 | |
056a3cac TG |
681 | tp->tv_sec = 0; |
682 | tp->tv_nsec = hrtimer_resolution; | |
683 | return 0; | |
9a7adcf5 JS |
684 | } |
685 | ||
686 | /** | |
eaf80194 | 687 | * alarm_clock_get_timespec - posix clock_get_timespec interface |
9a7adcf5 JS |
688 | * @which_clock: clockid |
689 | * @tp: timespec to fill. | |
690 | * | |
9c71a2e8 | 691 | * Provides the underlying alarm base time in a tasks time namespace. |
9a7adcf5 | 692 | */ |
eaf80194 | 693 | static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp) |
9a7adcf5 JS |
694 | { |
695 | struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)]; | |
696 | ||
1c6b39ad | 697 | if (!alarmtimer_get_rtcdev()) |
98d6f4dd | 698 | return -EINVAL; |
1c6b39ad | 699 | |
2f58bf90 AV |
700 | base->get_timespec(tp); |
701 | ||
9a7adcf5 JS |
702 | return 0; |
703 | } | |
704 | ||
9c71a2e8 AV |
705 | /** |
706 | * alarm_clock_get_ktime - posix clock_get_ktime interface | |
707 | * @which_clock: clockid | |
708 | * | |
709 | * Provides the underlying alarm base time in the root namespace. | |
710 | */ | |
711 | static ktime_t alarm_clock_get_ktime(clockid_t which_clock) | |
712 | { | |
713 | struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)]; | |
714 | ||
715 | if (!alarmtimer_get_rtcdev()) | |
716 | return -EINVAL; | |
717 | ||
718 | return base->get_ktime(); | |
719 | } | |
720 | ||
9a7adcf5 JS |
721 | /** |
722 | * alarm_timer_create - posix timer_create interface | |
723 | * @new_timer: k_itimer pointer to manage | |
724 | * | |
725 | * Initializes the k_itimer structure. | |
726 | */ | |
727 | static int alarm_timer_create(struct k_itimer *new_timer) | |
728 | { | |
729 | enum alarmtimer_type type; | |
9a7adcf5 | 730 | |
1c6b39ad | 731 | if (!alarmtimer_get_rtcdev()) |
f18ddc13 | 732 | return -EOPNOTSUPP; |
1c6b39ad | 733 | |
9a7adcf5 JS |
734 | if (!capable(CAP_WAKE_ALARM)) |
735 | return -EPERM; | |
736 | ||
737 | type = clock2alarm(new_timer->it_clock); | |
9e264762 | 738 | alarm_init(&new_timer->it.alarm.alarmtimer, type, alarm_handle_timer); |
9a7adcf5 JS |
739 | return 0; |
740 | } | |
741 | ||
9a7adcf5 JS |
742 | /** |
743 | * alarmtimer_nsleep_wakeup - Wakeup function for alarm_timer_nsleep | |
744 | * @alarm: ptr to alarm that fired | |
b5c28ea6 | 745 | * @now: time at the timer expiration |
9a7adcf5 JS |
746 | * |
747 | * Wakes up the task that set the alarmtimer | |
b5c28ea6 AB |
748 | * |
749 | * Return: ALARMTIMER_NORESTART | |
9a7adcf5 | 750 | */ |
4b41308d JS |
751 | static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm, |
752 | ktime_t now) | |
9a7adcf5 JS |
753 | { |
754 | struct task_struct *task = (struct task_struct *)alarm->data; | |
755 | ||
756 | alarm->data = NULL; | |
757 | if (task) | |
758 | wake_up_process(task); | |
4b41308d | 759 | return ALARMTIMER_NORESTART; |
9a7adcf5 JS |
760 | } |
761 | ||
762 | /** | |
763 | * alarmtimer_do_nsleep - Internal alarmtimer nsleep implementation | |
764 | * @alarm: ptr to alarmtimer | |
765 | * @absexp: absolute expiration time | |
b5c28ea6 | 766 | * @type: alarm type (BOOTTIME/REALTIME). |
9a7adcf5 JS |
767 | * |
768 | * Sets the alarm timer and sleeps until it is fired or interrupted. | |
769 | */ | |
15f27ce2 AV |
770 | static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp, |
771 | enum alarmtimer_type type) | |
9a7adcf5 | 772 | { |
edbeda46 | 773 | struct restart_block *restart; |
9a7adcf5 JS |
774 | alarm->data = (void *)current; |
775 | do { | |
776 | set_current_state(TASK_INTERRUPTIBLE); | |
9e264762 | 777 | alarm_start(alarm, absexp); |
9a7adcf5 JS |
778 | if (likely(alarm->data)) |
779 | schedule(); | |
780 | ||
781 | alarm_cancel(alarm); | |
782 | } while (alarm->data && !signal_pending(current)); | |
783 | ||
784 | __set_current_state(TASK_RUNNING); | |
785 | ||
bd031430 TG |
786 | destroy_hrtimer_on_stack(&alarm->timer); |
787 | ||
15f27ce2 | 788 | if (!alarm->data) |
9a7adcf5 | 789 | return 0; |
9a7adcf5 | 790 | |
15f27ce2 AV |
791 | if (freezing(current)) |
792 | alarmtimer_freezerset(absexp, type); | |
edbeda46 AV |
793 | restart = ¤t->restart_block; |
794 | if (restart->nanosleep.type != TT_NONE) { | |
c0edd7c9 | 795 | struct timespec64 rmt; |
15f27ce2 | 796 | ktime_t rem; |
9a7adcf5 | 797 | |
41b3b8df | 798 | rem = ktime_sub(absexp, alarm_bases[type].get_ktime()); |
9a7adcf5 | 799 | |
15f27ce2 AV |
800 | if (rem <= 0) |
801 | return 0; | |
c0edd7c9 | 802 | rmt = ktime_to_timespec64(rem); |
15f27ce2 | 803 | |
ce41aaf4 | 804 | return nanosleep_copyout(restart, &rmt); |
15f27ce2 AV |
805 | } |
806 | return -ERESTART_RESTARTBLOCK; | |
9a7adcf5 JS |
807 | } |
808 | ||
bd031430 TG |
809 | static void |
810 | alarm_init_on_stack(struct alarm *alarm, enum alarmtimer_type type, | |
811 | enum alarmtimer_restart (*function)(struct alarm *, ktime_t)) | |
812 | { | |
813 | hrtimer_init_on_stack(&alarm->timer, alarm_bases[type].base_clockid, | |
814 | HRTIMER_MODE_ABS); | |
815 | __alarm_init(alarm, type, function); | |
816 | } | |
817 | ||
9a7adcf5 JS |
818 | /** |
819 | * alarm_timer_nsleep_restart - restartblock alarmtimer nsleep | |
820 | * @restart: ptr to restart block | |
821 | * | |
822 | * Handles restarted clock_nanosleep calls | |
823 | */ | |
824 | static long __sched alarm_timer_nsleep_restart(struct restart_block *restart) | |
825 | { | |
ab8177bc | 826 | enum alarmtimer_type type = restart->nanosleep.clockid; |
15f27ce2 | 827 | ktime_t exp = restart->nanosleep.expires; |
9a7adcf5 | 828 | struct alarm alarm; |
9a7adcf5 | 829 | |
bd031430 | 830 | alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup); |
9a7adcf5 | 831 | |
15f27ce2 | 832 | return alarmtimer_do_nsleep(&alarm, exp, type); |
9a7adcf5 JS |
833 | } |
834 | ||
835 | /** | |
836 | * alarm_timer_nsleep - alarmtimer nanosleep | |
837 | * @which_clock: clockid | |
4bf07f65 | 838 | * @flags: determines abstime or relative |
9a7adcf5 | 839 | * @tsreq: requested sleep time (abs or rel) |
9a7adcf5 JS |
840 | * |
841 | * Handles clock_nanosleep calls against _ALARM clockids | |
842 | */ | |
843 | static int alarm_timer_nsleep(const clockid_t which_clock, int flags, | |
938e7cf2 | 844 | const struct timespec64 *tsreq) |
9a7adcf5 JS |
845 | { |
846 | enum alarmtimer_type type = clock2alarm(which_clock); | |
15f27ce2 | 847 | struct restart_block *restart = ¤t->restart_block; |
9a7adcf5 JS |
848 | struct alarm alarm; |
849 | ktime_t exp; | |
850 | int ret = 0; | |
9a7adcf5 | 851 | |
1c6b39ad | 852 | if (!alarmtimer_get_rtcdev()) |
f18ddc13 | 853 | return -EOPNOTSUPP; |
1c6b39ad | 854 | |
16927776 JS |
855 | if (flags & ~TIMER_ABSTIME) |
856 | return -EINVAL; | |
857 | ||
9a7adcf5 JS |
858 | if (!capable(CAP_WAKE_ALARM)) |
859 | return -EPERM; | |
860 | ||
bd031430 | 861 | alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup); |
9a7adcf5 | 862 | |
ad196384 | 863 | exp = timespec64_to_ktime(*tsreq); |
9a7adcf5 JS |
864 | /* Convert (if necessary) to absolute time */ |
865 | if (flags != TIMER_ABSTIME) { | |
41b3b8df | 866 | ktime_t now = alarm_bases[type].get_ktime(); |
5f936e19 TG |
867 | |
868 | exp = ktime_add_safe(now, exp); | |
0b9b9a3b AV |
869 | } else { |
870 | exp = timens_ktime_to_host(which_clock, exp); | |
9a7adcf5 JS |
871 | } |
872 | ||
15f27ce2 AV |
873 | ret = alarmtimer_do_nsleep(&alarm, exp, type); |
874 | if (ret != -ERESTART_RESTARTBLOCK) | |
875 | return ret; | |
9a7adcf5 JS |
876 | |
877 | /* abs timers don't set remaining time or restart */ | |
15f27ce2 AV |
878 | if (flags == TIMER_ABSTIME) |
879 | return -ERESTARTNOHAND; | |
9a7adcf5 | 880 | |
ab8177bc | 881 | restart->nanosleep.clockid = type; |
2456e855 | 882 | restart->nanosleep.expires = exp; |
5abbe51a | 883 | set_restart_fn(restart, alarm_timer_nsleep_restart); |
9a7adcf5 JS |
884 | return ret; |
885 | } | |
ff3ead96 | 886 | |
d3ba5a9a | 887 | const struct k_clock alarm_clock = { |
d653d845 | 888 | .clock_getres = alarm_clock_getres, |
9c71a2e8 | 889 | .clock_get_ktime = alarm_clock_get_ktime, |
eaf80194 | 890 | .clock_get_timespec = alarm_clock_get_timespec, |
d653d845 | 891 | .timer_create = alarm_timer_create, |
f2c45807 TG |
892 | .timer_set = common_timer_set, |
893 | .timer_del = common_timer_del, | |
894 | .timer_get = common_timer_get, | |
b3bf6f36 | 895 | .timer_arm = alarm_timer_arm, |
d653d845 TG |
896 | .timer_rearm = alarm_timer_rearm, |
897 | .timer_forward = alarm_timer_forward, | |
898 | .timer_remaining = alarm_timer_remaining, | |
e344c9e7 | 899 | .timer_try_to_cancel = alarm_timer_try_to_cancel, |
ec8f954a | 900 | .timer_wait_running = alarm_timer_wait_running, |
d653d845 | 901 | .nsleep = alarm_timer_nsleep, |
d3ba5a9a CH |
902 | }; |
903 | #endif /* CONFIG_POSIX_TIMERS */ | |
904 | ||
ff3ead96 JS |
905 | |
906 | /* Suspend hook structures */ | |
907 | static const struct dev_pm_ops alarmtimer_pm_ops = { | |
908 | .suspend = alarmtimer_suspend, | |
a0e3213f | 909 | .resume = alarmtimer_resume, |
ff3ead96 JS |
910 | }; |
911 | ||
912 | static struct platform_driver alarmtimer_driver = { | |
913 | .driver = { | |
914 | .name = "alarmtimer", | |
915 | .pm = &alarmtimer_pm_ops, | |
916 | } | |
917 | }; | |
918 | ||
5a590f35 AV |
919 | static void get_boottime_timespec(struct timespec64 *tp) |
920 | { | |
921 | ktime_get_boottime_ts64(tp); | |
922 | timens_add_boottime(tp); | |
923 | } | |
924 | ||
ff3ead96 JS |
925 | /** |
926 | * alarmtimer_init - Initialize alarm timer code | |
927 | * | |
928 | * This function initializes the alarm bases and registers | |
929 | * the posix clock ids. | |
930 | */ | |
931 | static int __init alarmtimer_init(void) | |
932 | { | |
c79108bd | 933 | int error; |
ff3ead96 | 934 | int i; |
9a7adcf5 | 935 | |
c5e14e76 | 936 | alarmtimer_rtc_timer_init(); |
ad30dfa9 | 937 | |
ff3ead96 JS |
938 | /* Initialize alarm bases */ |
939 | alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME; | |
41b3b8df | 940 | alarm_bases[ALARM_REALTIME].get_ktime = &ktime_get_real; |
ec02821c | 941 | alarm_bases[ALARM_REALTIME].get_timespec = ktime_get_real_ts64; |
ff3ead96 | 942 | alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME; |
41b3b8df | 943 | alarm_bases[ALARM_BOOTTIME].get_ktime = &ktime_get_boottime; |
5a590f35 | 944 | alarm_bases[ALARM_BOOTTIME].get_timespec = get_boottime_timespec; |
ff3ead96 JS |
945 | for (i = 0; i < ALARM_NUMTYPE; i++) { |
946 | timerqueue_init_head(&alarm_bases[i].timerqueue); | |
947 | spin_lock_init(&alarm_bases[i].lock); | |
ff3ead96 | 948 | } |
8bc0dafb | 949 | |
4523f6ad TG |
950 | error = alarmtimer_rtc_interface_setup(); |
951 | if (error) | |
952 | return error; | |
953 | ||
ff3ead96 | 954 | error = platform_driver_register(&alarmtimer_driver); |
4523f6ad TG |
955 | if (error) |
956 | goto out_if; | |
ff3ead96 | 957 | |
4523f6ad | 958 | return 0; |
4523f6ad TG |
959 | out_if: |
960 | alarmtimer_rtc_interface_remove(); | |
ff3ead96 JS |
961 | return error; |
962 | } | |
963 | device_initcall(alarmtimer_init); |