ACK: Oneiric SRU: genirq: Fix irqfixup, irqpoll regression
stefan.bader at canonical.com
Mon Nov 21 14:16:09 UTC 2011
On 21.11.2011 01:44, Tim Gardner wrote:
> From 3f21b6ce938f2df057659e2e1cdbeddac0bda3c8 Mon Sep 17 00:00:00 2001
> From: Edward Donovan <edward.donovan at numble.net>
> Date: Tue, 1 Nov 2011 15:29:44 -0400
> Subject: [PATCH] genirq: Fix irqfixup, irqpoll regression
> BugLink: http://bugs.launchpad.net/bugs/855199
> commit d05c65fff0 ("genirq: spurious: Run only one poller at a time")
> introduced a regression, leaving the boot options 'irqfixup' and
> 'irqpoll' non-functional. The patch placed tests in each function, to
> exit if the function is already running. The test in 'misrouted_irq'
> exited when it should have proceeded, effectively disabling
> 'misrouted_irq' and 'poll_spurious_irqs'.
> The check for an already running poller needs to be "!= 1" not "== 1"
> as "1" is the value when the first poller starts running.
> Signed-off-by: Edward Donovan <edward.donovan at numble.net>
> Cc: maciej.rutecki at gmail.com
> Link: http://firstname.lastname@example.org
> Cc: stable at vger.kernel.org # >= 2.6.39
> Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
> (cherry picked from commit c75d720fca8a91ce99196d33adea383621027bf2)
> Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
> kernel/irq/spurious.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
> diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
> index aa57d5d..b5f4742 100644
> --- a/kernel/irq/spurious.c
> +++ b/kernel/irq/spurious.c
> @@ -115,7 +115,7 @@ static int misrouted_irq(int irq)
> struct irq_desc *desc;
> int i, ok = 0;
> - if (atomic_inc_return(&irq_poll_active) == 1)
> + if (atomic_inc_return(&irq_poll_active) != 1)
> goto out;
> irq_poll_cpu = smp_processor_id();
Seems to be doing what it claims.
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