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1da177e4 LT |
1 | /* |
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 | ||
25 | static 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 | ||
52c1da39 | 48 | static void report_bad_irq(unsigned int irq, irq_desc_t *desc, irqreturn_t action_ret) |
1da177e4 LT |
49 | { |
50 | static int count = 100; | |
51 | ||
52 | if (count > 0) { | |
53 | count--; | |
54 | __report_bad_irq(irq, desc, action_ret); | |
55 | } | |
56 | } | |
57 | ||
58 | void 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 | ||
86 | int noirqdebug; | |
87 | ||
88 | int __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 |