manage.c (7d94f7ca401dd7f445fda9a971a48aa5427b3e55) manage.c (cb5bc83225a86ca53bbb889ed8439e4fd6cf44ac)
1/*
2 * linux/kernel/irq/manage.c
3 *
4 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
5 * Copyright (C) 2005-2006 Thomas Gleixner
6 *
7 * This file contains driver APIs to the irq subsystem.
8 */

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26 * This function waits for any pending IRQ handlers for this interrupt
27 * to complete before returning. If you use this function while
28 * holding a resource the IRQ handler may need you will deadlock.
29 *
30 * This function may be called - with care - from IRQ context.
31 */
32void synchronize_irq(unsigned int irq)
33{
1/*
2 * linux/kernel/irq/manage.c
3 *
4 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
5 * Copyright (C) 2005-2006 Thomas Gleixner
6 *
7 * This file contains driver APIs to the irq subsystem.
8 */

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26 * This function waits for any pending IRQ handlers for this interrupt
27 * to complete before returning. If you use this function while
28 * holding a resource the IRQ handler may need you will deadlock.
29 *
30 * This function may be called - with care - from IRQ context.
31 */
32void synchronize_irq(unsigned int irq)
33{
34 struct irq_desc *desc = __irq_to_desc(irq);
34 struct irq_desc *desc = irq_to_desc(irq);
35 unsigned int status;
36
37 if (!desc)
38 return;
39
40 do {
41 unsigned long flags;
42

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140 *
141 * This function may be called from IRQ context.
142 */
143void disable_irq_nosync(unsigned int irq)
144{
145 struct irq_desc *desc;
146 unsigned long flags;
147
35 unsigned int status;
36
37 if (!desc)
38 return;
39
40 do {
41 unsigned long flags;
42

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140 *
141 * This function may be called from IRQ context.
142 */
143void disable_irq_nosync(unsigned int irq)
144{
145 struct irq_desc *desc;
146 unsigned long flags;
147
148 desc = __irq_to_desc(irq);
148 desc = irq_to_desc(irq);
149 if (!desc)
150 return;
151
152 spin_lock_irqsave(&desc->lock, flags);
153 if (!desc->depth++) {
154 desc->status |= IRQ_DISABLED;
155 desc->chip->disable(irq);
156 }

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169 * holding a resource the IRQ handler may need you will deadlock.
170 *
171 * This function may be called - with care - from IRQ context.
172 */
173void disable_irq(unsigned int irq)
174{
175 struct irq_desc *desc;
176
149 if (!desc)
150 return;
151
152 spin_lock_irqsave(&desc->lock, flags);
153 if (!desc->depth++) {
154 desc->status |= IRQ_DISABLED;
155 desc->chip->disable(irq);
156 }

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169 * holding a resource the IRQ handler may need you will deadlock.
170 *
171 * This function may be called - with care - from IRQ context.
172 */
173void disable_irq(unsigned int irq)
174{
175 struct irq_desc *desc;
176
177 desc = __irq_to_desc(irq);
177 desc = irq_to_desc(irq);
178 if (!desc)
179 return;
180
181 disable_irq_nosync(irq);
182 if (desc->action)
183 synchronize_irq(irq);
184}
185EXPORT_SYMBOL(disable_irq);

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213 *
214 * This function may be called from IRQ context.
215 */
216void enable_irq(unsigned int irq)
217{
218 struct irq_desc *desc;
219 unsigned long flags;
220
178 if (!desc)
179 return;
180
181 disable_irq_nosync(irq);
182 if (desc->action)
183 synchronize_irq(irq);
184}
185EXPORT_SYMBOL(disable_irq);

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213 *
214 * This function may be called from IRQ context.
215 */
216void enable_irq(unsigned int irq)
217{
218 struct irq_desc *desc;
219 unsigned long flags;
220
221 desc = __irq_to_desc(irq);
221 desc = irq_to_desc(irq);
222 if (!desc)
223 return;
224
225 spin_lock_irqsave(&desc->lock, flags);
226 __enable_irq(desc, irq);
227 spin_unlock_irqrestore(&desc->lock, flags);
228}
229EXPORT_SYMBOL(enable_irq);

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291 * particular irq has been exclusively allocated or is available
292 * for driver use.
293 */
294int can_request_irq(unsigned int irq, unsigned long irqflags)
295{
296 struct irq_desc *desc;
297 struct irqaction *action;
298
222 if (!desc)
223 return;
224
225 spin_lock_irqsave(&desc->lock, flags);
226 __enable_irq(desc, irq);
227 spin_unlock_irqrestore(&desc->lock, flags);
228}
229EXPORT_SYMBOL(enable_irq);

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291 * particular irq has been exclusively allocated or is available
292 * for driver use.
293 */
294int can_request_irq(unsigned int irq, unsigned long irqflags)
295{
296 struct irq_desc *desc;
297 struct irqaction *action;
298
299 desc = __irq_to_desc(irq);
299 desc = irq_to_desc(irq);
300 if (!desc)
301 return 0;
302
303 if (desc->status & IRQ_NOREQUEST)
304 return 0;
305
306 action = desc->action;
307 if (action)

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361{
362 struct irq_desc *desc;
363 struct irqaction *old, **p;
364 const char *old_name = NULL;
365 unsigned long flags;
366 int shared = 0;
367 int ret;
368
300 if (!desc)
301 return 0;
302
303 if (desc->status & IRQ_NOREQUEST)
304 return 0;
305
306 action = desc->action;
307 if (action)

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361{
362 struct irq_desc *desc;
363 struct irqaction *old, **p;
364 const char *old_name = NULL;
365 unsigned long flags;
366 int shared = 0;
367 int ret;
368
369 desc = __irq_to_desc(irq);
369 desc = irq_to_desc(irq);
370 if (!desc)
371 return -EINVAL;
372
373 if (desc->chip == &no_irq_chip)
374 return -ENOSYS;
375 /*
376 * Some drivers like serial.c use request_irq() heavily,
377 * so we have to be careful not to interfere with a

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522void free_irq(unsigned int irq, void *dev_id)
523{
524 struct irq_desc *desc;
525 struct irqaction **p;
526 unsigned long flags;
527
528 WARN_ON(in_interrupt());
529
370 if (!desc)
371 return -EINVAL;
372
373 if (desc->chip == &no_irq_chip)
374 return -ENOSYS;
375 /*
376 * Some drivers like serial.c use request_irq() heavily,
377 * so we have to be careful not to interfere with a

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522void free_irq(unsigned int irq, void *dev_id)
523{
524 struct irq_desc *desc;
525 struct irqaction **p;
526 unsigned long flags;
527
528 WARN_ON(in_interrupt());
529
530 desc = __irq_to_desc(irq);
530 desc = irq_to_desc(irq);
531 if (!desc)
532 return;
533
534 spin_lock_irqsave(&desc->lock, flags);
535 p = &desc->action;
536 for (;;) {
537 struct irqaction *action = *p;
538

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639 * Sanity-check: shared interrupts must pass in a real dev-ID,
640 * otherwise we'll have trouble later trying to figure out
641 * which interrupt is which (messes up the interrupt freeing
642 * logic etc).
643 */
644 if ((irqflags & IRQF_SHARED) && !dev_id)
645 return -EINVAL;
646
531 if (!desc)
532 return;
533
534 spin_lock_irqsave(&desc->lock, flags);
535 p = &desc->action;
536 for (;;) {
537 struct irqaction *action = *p;
538

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639 * Sanity-check: shared interrupts must pass in a real dev-ID,
640 * otherwise we'll have trouble later trying to figure out
641 * which interrupt is which (messes up the interrupt freeing
642 * logic etc).
643 */
644 if ((irqflags & IRQF_SHARED) && !dev_id)
645 return -EINVAL;
646
647 desc = __irq_to_desc(irq);
647 desc = irq_to_desc(irq);
648 if (!desc)
649 return -EINVAL;
650
651 if (desc->status & IRQ_NOREQUEST)
652 return -EINVAL;
653 if (!handler)
654 return -EINVAL;
655

--- 37 unchanged lines hidden --- 		648 if (!desc)
649 return -EINVAL;
650
651 if (desc->status & IRQ_NOREQUEST)
652 return -EINVAL;
653 if (!handler)
654 return -EINVAL;
655

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