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| author | Ingo Molnar <mingo@elte.hu> | 2009-01-16 17:43:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-16 17:46:49 +0100 |
| commit | 74296a8ed6aa3c5bf672808ada690de7ba323ecc (patch) | |
| tree | baf9aa0f86e27d33dff0c4d0e33774fe80c908bc | |
| parent | 5a2dd72abdae75ea2960145e0549635ce4e0be96 (diff) | |
| download | op-kernel-dev-74296a8ed6aa3c5bf672808ada690de7ba323ecc.zip op-kernel-dev-74296a8ed6aa3c5bf672808ada690de7ba323ecc.tar.gz | |
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: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/linux/interrupt.h | 6 | ||||
| -rw-r--r-- | kernel/irq/spurious.c | 14 |
2 files changed, 19 insertions, 1 deletions
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 9127f6b..468e3a2 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -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; diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c index dd364c1..4d56829 100644 --- a/kernel/irq/spurious.c +++ b/kernel/irq/spurious.c @@ -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 |
