blob: ba039e827d589d5b7f5e7da054ffab95b1e5589b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/kernel/irq/spurious.c
3 *
4 * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
5 *
6 * This file contains spurious interrupt handling.
7 */
8
9#include <linux/irq.h>
10#include <linux/module.h>
11#include <linux/kallsyms.h>
12#include <linux/interrupt.h>
13
14/*
15 * If 99,900 of the previous 100,000 interrupts have not been handled
16 * then assume that the IRQ is stuck in some manner. Drop a diagnostic
17 * and try to turn the IRQ off.
18 *
19 * (The other 100-of-100,000 interrupts may have been a correctly
20 * functioning device sharing an IRQ with the failing one)
21 *
22 * Called under desc->lock
23 */
24
25static void
26__report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
27{
28 struct irqaction *action;
29
30 if (action_ret != IRQ_HANDLED && action_ret != IRQ_NONE) {
31 printk(KERN_ERR "irq event %d: bogus return value %x\n",
32 irq, action_ret);
33 } else {
34 printk(KERN_ERR "irq %d: nobody cared!\n", irq);
35 }
36 dump_stack();
37 printk(KERN_ERR "handlers:\n");
38 action = desc->action;
39 while (action) {
40 printk(KERN_ERR "[<%p>]", action->handler);
41 print_symbol(" (%s)",
42 (unsigned long)action->handler);
43 printk("\n");
44 action = action->next;
45 }
46}
47
Adrian Bunk52c1da32005-06-23 22:05:33 -070048static void report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
50 static int count = 100;
51
52 if (count > 0) {
53 count--;
54 __report_bad_irq(irq, desc, action_ret);
55 }
56}
57
58void note_interrupt(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret)
59{
60 if (action_ret != IRQ_HANDLED) {
61 desc->irqs_unhandled++;
62 if (action_ret != IRQ_NONE)
63 report_bad_irq(irq, desc, action_ret);
64 }
65
66 desc->irq_count++;
67 if (desc->irq_count < 100000)
68 return;
69
70 desc->irq_count = 0;
71 if (desc->irqs_unhandled > 99900) {
72 /*
73 * The interrupt is stuck
74 */
75 __report_bad_irq(irq, desc, action_ret);
76 /*
77 * Now kill the IRQ
78 */
79 printk(KERN_EMERG "Disabling IRQ #%d\n", irq);
80 desc->status |= IRQ_DISABLED;
81 desc->handler->disable(irq);
82 }
83 desc->irqs_unhandled = 0;
84}
85
86int noirqdebug;
87
88int __init noirqdebug_setup(char *str)
89{
90 noirqdebug = 1;
91 printk(KERN_INFO "IRQ lockup detection disabled\n");
92 return 1;
93}
94
95__setup("noirqdebug", noirqdebug_setup);
96