[PATCH] pinctrl: armada-37xx: Fix spurious irq management

[PATCH] pinctrl: armada-37xx: Fix spurious irq management

[Gregory CLEMENT]

From: Terry Zhou <bjzhou@marvell.com>

Until now, if we found spurious irq in irq_handler, we only updated the
status in register but not the status in the code. Due to this the system
will got stuck dues to the infinite loop

[gregory.clement at bootlin.com: update comment and add fix and stable tags]
Fixes: 30ac0d3b0702 ("pinctrl: armada-37xx: Add edge both type gpio irq support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Terry Zhou <bjzhou@marvell.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---
 drivers/pinctrl/mvebu/pinctrl-armada-37xx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
index 5b63248c8209..7bef929bd7fe 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
@@ -679,12 +679,13 @@ static void armada_37xx_irq_handler(struct irq_desc *desc)
 					writel(1 << hwirq,
 					       info->base +
 					       IRQ_STATUS + 4 * i);
-					continue;
+					goto update_status;
 				}
 			}
 
 			generic_handle_irq(virq);
 
+update_status:
 			/* Update status in case a new IRQ appears */
 			spin_lock_irqsave(&info->irq_lock, flags);
 			status = readl_relaxed(info->base +
-- 
2.17.0

[PATCH] pinctrl: armada-37xx: Fix spurious irq management

[Linus Walleij]

On Wed, May 23, 2018 at 10:44 AM, Gregory CLEMENT
<gregory.clement@bootlin.com> wrote:

> From: Terry Zhou <bjzhou@marvell.com>
>
> Until now, if we found spurious irq in irq_handler, we only updated the
> status in register but not the status in the code. Due to this the system
> will got stuck dues to the infinite loop
>
> [gregory.clement at bootlin.com: update comment and add fix and stable tags]
> Fixes: 30ac0d3b0702 ("pinctrl: armada-37xx: Add edge both type gpio irq support")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Terry Zhou <bjzhou@marvell.com>
> Reviewed-by: Gregory CLEMENT <gregory.clement@bootlin.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

Patch applied.

Yours,
Linus Walleij