From d05c65fff0ef672be75429266751f0e015b54d94 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner <tglx@linutronix.de> Date: Mon, 7 Feb 2011 14:31:37 +0100 Subject: [PATCH] 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: Thomas Gleixner <tglx@linutronix.de> --- kernel/irq/spurious.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c index bd0e42d3e0ba..56ff8fffb8b0 100644 --- a/kernel/irq/spurious.c +++ b/kernel/irq/spurious.c @@ -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); } -- 2.20.1