manage.c (fece13ca005a5f559147e9424321f4b5e01272b4) manage.c (02cea3958664723a5d2236f0f0058de97c7e4693)
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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63 * interrupt to complete before returning. If you use this
64 * function while holding a resource the IRQ handler may need you
65 * will deadlock. It does not take associated threaded handlers
66 * into account.
67 *
68 * Do not use this for shutdown scenarios where you must be sure
69 * that all parts (hardirq and threaded handler) have completed.
70 *
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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63 * interrupt to complete before returning. If you use this
64 * function while holding a resource the IRQ handler may need you
65 * will deadlock. It does not take associated threaded handlers
66 * into account.
67 *
68 * Do not use this for shutdown scenarios where you must be sure
69 * that all parts (hardirq and threaded handler) have completed.
70 *
71 * Returns: false if a threaded handler is active.
72 *
71 * This function may be called - with care - from IRQ context.
72 */
73 * This function may be called - with care - from IRQ context.
74 */
73void synchronize_hardirq(unsigned int irq)
75bool synchronize_hardirq(unsigned int irq)
74{
75 struct irq_desc *desc = irq_to_desc(irq);
76
76{
77 struct irq_desc *desc = irq_to_desc(irq);
78
77 if (desc)
79 if (desc) {
78 __synchronize_hardirq(desc);
80 __synchronize_hardirq(desc);
81 return !atomic_read(&desc->threads_active);
82 }
83
84 return true;
79}
80EXPORT_SYMBOL(synchronize_hardirq);
81
82/**
83 * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
84 * @irq: interrupt number to wait for
85 *
86 * This function waits for any pending IRQ handlers for this interrupt

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435 */
436void disable_irq(unsigned int irq)
437{
438 if (!__disable_irq_nosync(irq))
439 synchronize_irq(irq);
440}
441EXPORT_SYMBOL(disable_irq);
442
85}
86EXPORT_SYMBOL(synchronize_hardirq);
87
88/**
89 * synchronize_irq - wait for pending IRQ handlers (on other CPUs)
90 * @irq: interrupt number to wait for
91 *
92 * This function waits for any pending IRQ handlers for this interrupt

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441 */
442void disable_irq(unsigned int irq)
443{
444 if (!__disable_irq_nosync(irq))
445 synchronize_irq(irq);
446}
447EXPORT_SYMBOL(disable_irq);
448
449/**
450 * disable_hardirq - disables an irq and waits for hardirq completion
451 * @irq: Interrupt to disable
452 *
453 * Disable the selected interrupt line. Enables and Disables are
454 * nested.
455 * This function waits for any pending hard IRQ handlers for this
456 * interrupt to complete before returning. If you use this function while
457 * holding a resource the hard IRQ handler may need you will deadlock.
458 *
459 * When used to optimistically disable an interrupt from atomic context
460 * the return value must be checked.
461 *
462 * Returns: false if a threaded handler is active.
463 *
464 * This function may be called - with care - from IRQ context.
465 */
466bool disable_hardirq(unsigned int irq)
467{
468 if (!__disable_irq_nosync(irq))
469 return synchronize_hardirq(irq);
470
471 return false;
472}
473EXPORT_SYMBOL_GPL(disable_hardirq);
474
443void __enable_irq(struct irq_desc *desc, unsigned int irq)
444{
445 switch (desc->depth) {
446 case 0:
447 err_out:
448 WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
449 break;
450 case 1: {

--- 1313 unchanged lines hidden --- 		475void __enable_irq(struct irq_desc *desc, unsigned int irq)
476{
477 switch (desc->depth) {
478 case 0:
479 err_out:
480 WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
481 break;
482 case 1: {

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