linux-kernel - [01/53] genirq: Fix irqfixup, irqpoll regression

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Message-Id: <20111123002404.677589039@clark.kroah.org>
Date:	Tue, 22 Nov 2011 16:23:08 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Edward Donovan <edward.donovan@...ble.net>,
	maciej.rutecki@...il.com, Thomas Gleixner <tglx@...utronix.de>
Subject: [01/53] genirq: Fix irqfixup, irqpoll regression

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Edward Donovan <edward.donovan@...ble.net>

commit c75d720fca8a91ce99196d33adea383621027bf2 upstream.

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@...ble.net>
Cc: maciej.rutecki@...il.com
Link: http://lkml.kernel.org/r/1320175784-6745-1-git-send-email-edward.donovan@numble.net
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/irq/spurious.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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();


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