提交 d05c65ff 编写于 作者: T Thomas Gleixner

genirq: spurious: Run only one poller at a time

No point in running concurrent pollers which confuse each other by
setting PENDING.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
上级 c7259cd7
......@@ -21,6 +21,8 @@ static int irqfixup __read_mostly;
#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
static void poll_spurious_irqs(unsigned long dummy);
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.
......@@ -92,6 +94,11 @@ static int misrouted_irq(int irq)
struct irq_desc *desc;
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) {
if (!i)
continue;
......@@ -102,6 +109,8 @@ static int misrouted_irq(int irq)
if (try_one_irq(i, desc, false))
ok = 1;
}
out:
atomic_dec(&irq_poll_active);
/* So the caller can adjust the irq error counts */
return ok;
}
......@@ -111,6 +120,10 @@ static void poll_spurious_irqs(unsigned long dummy)
struct irq_desc *desc;
int i;
if (atomic_inc_return(&irq_poll_active) != 1)
goto out;
irq_poll_cpu = smp_processor_id();
for_each_irq_desc(i, desc) {
unsigned int status;
......@@ -127,7 +140,8 @@ static void poll_spurious_irqs(unsigned long dummy)
try_one_irq(i, desc, true);
local_irq_enable();
}
out:
atomic_dec(&irq_poll_active);
mod_timer(&poll_spurious_irq_timer,
jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
}
......
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