Commit 74296a8e authored by Ingo Molnar's avatar Ingo Molnar
Browse files

irq: provide debug_poll_all_shared_irqs() method under CONFIG_DEBUG_SHIRQ 



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: default avatarIngo Molnar <mingo@elte.hu>
parent 5a2dd72a

include/linux/interrupt.h

+6 −0
Original line number Diff line number Diff line
@@ -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;

kernel/irq/spurious.c

+13 −1
Original line number Diff line number Diff line
@@ -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

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