[PATCH 4.17 118/220] pinctrl: armada-37xx: Fix spurious irq management

From: Greg Kroah-Hartman
Date: Sun Jul 01 2018 - 13:01:02 EST

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


From: Terry Zhou <bjzhou@xxxxxxxxxxx>

commit 702d1e81feae70aa16ca364b4d2d95ccad801022 upstream.

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@xxxxxxxxxxx: update comment and add fix and stable tags]
Fixes: 30ac0d3b0702 ("pinctrl: armada-37xx: Add edge both type gpio irq support")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Terry Zhou <bjzhou@xxxxxxxxxxx>
Reviewed-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/pinctrl/mvebu/pinctrl-armada-37xx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- 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(stru
writel(1 << hwirq,
info->base +
IRQ_STATUS + 4 * i);
- continue;
+ goto update_status;


/* Update status in case a new IRQ appears */
spin_lock_irqsave(&info->irq_lock, flags);
status = readl_relaxed(info->base +