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| author | Thomas Gleixner <tglx@linutronix.de> | 2011-02-07 14:31:37 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-19 12:58:09 +0100 |
| commit | d05c65fff0ef672be75429266751f0e015b54d94 (patch) | |
| tree | 96b6b8ec9d8ab6d94e4f84bb8bcf32def1fe9e2a /kernel/irq/spurious.c | |
| parent | c7259cd7af757ddcd65701c37099dcddae2054f0 (diff) | |
| download | linux-d05c65fff0ef672be75429266751f0e015b54d94.tar.bz2 | |
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>
Diffstat (limited to 'kernel/irq/spurious.c')
| -rw-r--r-- | kernel/irq/spurious.c | 16 |
1 files changed, 15 insertions, 1 deletions
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); } |