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irq: provide debug_poll_all_shared_irqs() method under CONFIG_DEBUG_SHIRQ

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Provide a shared interrupt debug facility under CONFIG_DEBUG_SHIRQ:
it uses the existing irqpoll facilities to iterate through all
registered interrupt handlers and call those which can handle shared
IRQ lines.

This can be handy for suspend/resume debugging: if we call this function
early during resume we can trigger crashes in those drivers which have
incorrect assumptions about when exactly their ISRs will be called
during suspend/resume.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-01-16 17:43:50 +01:00
parent 5a2dd72abd
commit 74296a8ed6
2 changed files with 19 additions and 1 deletions
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6
include/linux/interrupt.h
View file

@ -462,6 +462,12 @@ static inline void init_irq_proc(void)
}
#endif
#if defined(CONFIG_GENERIC_HARDIRQS) && defined(CONFIG_DEBUG_SHIRQ)
extern void debug_poll_all_shared_irqs(void);
#else
static inline void debug_poll_all_shared_irqs(void) { }
#endif
int show_interrupts(struct seq_file *p, void *v);
struct irq_desc;

14
kernel/irq/spurious.c
View file

@ -104,7 +104,7 @@ static int misrouted_irq(int irq)
return ok;
}
static void poll_spurious_irqs(unsigned long dummy)
static void poll_all_shared_irqs(void)
{
struct irq_desc *desc;
int i;
@ -123,11 +123,23 @@ static void poll_spurious_irqs(unsigned long dummy)
try_one_irq(i, desc);
}
}
static void poll_spurious_irqs(unsigned long dummy)
{
poll_all_shared_irqs();
mod_timer(&poll_spurious_irq_timer,
jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
}
#ifdef CONFIG_DEBUG_SHIRQ
void debug_poll_all_shared_irqs(void)
{
poll_all_shared_irqs();
}
#endif
/*
* If 99,900 of the previous 100,000 interrupts have not been handled
* then assume that the IRQ is stuck in some manner. Drop a diagnostic