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genirq: spurious: Run only one poller at a time

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No point in running concurrent pollers which confuse each other by
setting PENDING.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2011-02-07 14:31:37 +01:00
parent c7259cd7af
commit d05c65fff0
1 changed files with 15 additions and 1 deletions
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16
kernel/irq/spurious.c
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@ -21,6 +21,8 @@ static int irqfixup __read_mostly;
#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10) #define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
static void poll_spurious_irqs(unsigned long dummy); static void poll_spurious_irqs(unsigned long dummy);
static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0); static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0);
static int irq_poll_cpu;
static atomic_t irq_poll_active;
/* /*
* Recovery handler for misrouted interrupts. * Recovery handler for misrouted interrupts.
@ -92,6 +94,11 @@ static int misrouted_irq(int irq)
struct irq_desc *desc; struct irq_desc *desc;
int i, ok = 0; int i, ok = 0;
if (atomic_inc_return(&irq_poll_active) == 1)
goto out;
irq_poll_cpu = smp_processor_id();
for_each_irq_desc(i, desc) { for_each_irq_desc(i, desc) {
if (!i) if (!i)
continue; continue;
@ -102,6 +109,8 @@ static int misrouted_irq(int irq)
if (try_one_irq(i, desc, false)) if (try_one_irq(i, desc, false))
ok = 1; ok = 1;
} }
out:
atomic_dec(&irq_poll_active);
/* So the caller can adjust the irq error counts */ /* So the caller can adjust the irq error counts */
return ok; return ok;
} }
@ -111,6 +120,10 @@ static void poll_spurious_irqs(unsigned long dummy)
struct irq_desc *desc; struct irq_desc *desc;
int i; int i;
if (atomic_inc_return(&irq_poll_active) != 1)
goto out;
irq_poll_cpu = smp_processor_id();
for_each_irq_desc(i, desc) { for_each_irq_desc(i, desc) {
unsigned int status; unsigned int status;
@ -127,7 +140,8 @@ static void poll_spurious_irqs(unsigned long dummy)
try_one_irq(i, desc, true); try_one_irq(i, desc, true);
local_irq_enable(); local_irq_enable();
} }
out:
atomic_dec(&irq_poll_active);
mod_timer(&poll_spurious_irq_timer, mod_timer(&poll_spurious_irq_timer,
jiffies + POLL_SPURIOUS_IRQ_INTERVAL); jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
} }