linux-kernel - [PATCH v2] gpio: siox: explicitly support only threaded irqs

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Message-Id: <20200907153135.3307-1-a.fatoum@pengutronix.de>
Date:   Mon,  7 Sep 2020 17:31:35 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Thorsten Scherer <t.scherer@...elmann.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     tglx@...utronix.de, Ahmad Fatoum <a.fatoum@...gutronix.de>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] gpio: siox: explicitly support only threaded irqs

The gpio-siox driver uses handle_nested_irq() to implement its
interrupt support. This is only capable of handling threaded irq
actions. For a hardirq action it triggers a NULL pointer oops.
(It calls action->thread_fn which is NULL then.)

Prevent registration of a hardirq action by setting
gpio_irq_chip::threaded to true.

Cc: u.kleine-koenig@...gutronix.de
Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
v1 -> v2:
  reworded commit message (Uwe)
---
 drivers/gpio/gpio-siox.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-siox.c b/drivers/gpio/gpio-siox.c
index 26e1fe092304..f8c5e9fc4bac 100644
--- a/drivers/gpio/gpio-siox.c
+++ b/drivers/gpio/gpio-siox.c
@@ -245,6 +245,7 @@ static int gpio_siox_probe(struct siox_device *sdevice)
 	girq->chip = &ddata->ichip;
 	girq->default_type = IRQ_TYPE_NONE;
 	girq->handler = handle_level_irq;
+	girq->threaded = true;
 
 	ret = devm_gpiochip_add_data(dev, &ddata->gchip, NULL);
 	if (ret)
-- 
2.28.0