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

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Message-Id: <20180701160913.284584352@linuxfoundation.org>
Date:   Sun,  1 Jul 2018 18:22:22 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Terry Zhou <bjzhou@...vell.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.17 118/220] pinctrl: armada-37xx: Fix spurious irq management

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

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

From: Terry Zhou <bjzhou@...vell.com>

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

---
 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;
 				}
 			}
 
 			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 +