linux-kernel - [PATCH 5.4 436/453] pinctrl: sunxi: Always call chained_irq_{enter, exit} in sunxi_pinctrl_irq

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Date:   Mon, 28 Dec 2020 13:51:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yangtao Li <frank@...winnertech.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 5.4 436/453] pinctrl: sunxi: Always call chained_irq_{enter, exit} in sunxi_pinctrl_irq_handler

From: Yangtao Li <frank@...winnertech.com>

commit a1158e36f876f6269978a4176e3a1d48d27fe7a1 upstream.

It is found on many allwinner soc that there is a low probability that
the interrupt status cannot be read in sunxi_pinctrl_irq_handler. This
will cause the interrupt status of a gpio bank to always be active on
gic, preventing gic from responding to other spi interrupts correctly.

So we should call the chained_irq_* each time enter sunxi_pinctrl_irq_handler().

Signed-off-by: Yangtao Li <frank@...winnertech.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/85263ce8b058e80cea25c6ad6383eb256ce96cc8.1604988979.git.frank@allwinnertech.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/sunxi/pinctrl-sunxi.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -1130,20 +1130,22 @@ static void sunxi_pinctrl_irq_handler(st
 	if (bank == pctl->desc->irq_banks)
 		return;
 
+	chained_irq_enter(chip, desc);
+
 	reg = sunxi_irq_status_reg_from_bank(pctl->desc, bank);
 	val = readl(pctl->membase + reg);
 
 	if (val) {
 		int irqoffset;
 
-		chained_irq_enter(chip, desc);
 		for_each_set_bit(irqoffset, &val, IRQ_PER_BANK) {
 			int pin_irq = irq_find_mapping(pctl->domain,
 						       bank * IRQ_PER_BANK + irqoffset);
 			generic_handle_irq(pin_irq);
 		}
-		chained_irq_exit(chip, desc);
 	}
+
+	chained_irq_exit(chip, desc);
 }
 
 static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,