linux-kernel - [ 08/95] ARM: LPC32xx: irq.c: Clear latched event

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Message-Id: <20120309190203.003579085@linuxfoundation.org>
Date:	Fri, 09 Mar 2012 11:02:10 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Roland Stigge <stigge@...com.de>
Subject: [ 08/95] ARM: LPC32xx: irq.c: Clear latched event

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

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

From: Roland Stigge <stigge@...com.de>

commit 94ed7830cba4dce57b18a2926b5d826bfd184bd6 upstream.

This patch fixes the wakeup disable function by clearing latched events.

Signed-off-by: Roland Stigge <stigge@...com.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mach-lpc32xx/irq.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/arch/arm/mach-lpc32xx/irq.c
+++ b/arch/arm/mach-lpc32xx/irq.c
@@ -305,9 +305,18 @@ static int lpc32xx_irq_wake(struct irq_d
 
 		if (state)
 			eventreg |= lpc32xx_events[d->irq].mask;
-		else
+		else {
 			eventreg &= ~lpc32xx_events[d->irq].mask;
 
+			/*
+			 * When disabling the wakeup, clear the latched
+			 * event
+			 */
+			__raw_writel(lpc32xx_events[d->irq].mask,
+				lpc32xx_events[d->irq].
+				event_group->rawstat_reg);
+		}
+
 		__raw_writel(eventreg,
 			lpc32xx_events[d->irq].event_group->enab_reg);
 


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