linux-kernel - [PATCH 3.13 144/172] irqchip: orion: clear bridge cause register on init

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Message-Id: <20140304200304.314947235@linuxfoundation.org>
Date:	Tue,  4 Mar 2014 12:03:48 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: [PATCH 3.13 144/172] irqchip: orion: clear bridge cause register on init

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

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

From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>

commit 7b119fd1bdc59a8060df5b659b9f7a70e0169fd6 upstream.

It is good practice to mask and clear pending irqs on init. We already
mask all irqs, so also clear the bridge irq cause register.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Signed-off-by: Jason Cooper <jason@...edaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/irqchip/irq-orion.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/irqchip/irq-orion.c
+++ b/drivers/irqchip/irq-orion.c
@@ -180,8 +180,9 @@ static int __init orion_bridge_irq_init(
 	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
 	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
 
-	/* mask all interrupts */
+	/* mask and clear all interrupts */
 	writel(0, gc->reg_base + ORION_BRIDGE_IRQ_MASK);
+	writel(0, gc->reg_base + ORION_BRIDGE_IRQ_CAUSE);
 
 	irq_set_handler_data(irq, domain);
 	irq_set_chained_handler(irq, orion_bridge_irq_handler);


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