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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, u.kleine-koenig@pengutronix.de,
        Ahmad Fatoum <a.fatoum@pengutronix.de>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: [PATCH 5.4 04/57] gpio: siox: explicitly support only threaded irqs
Date:   Mon,  5 Oct 2020 17:26:16 +0200
Message-Id: <20201005142110.016866225@linuxfoundation.org>
In-Reply-To: <20201005142109.796046410@linuxfoundation.org>
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From: Ahmad Fatoum <a.fatoum@pengutronix.de>

commit 45ccf6556720293323c20cda717756014ff63007 upstream.

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@pengutronix.de
Fixes: be8c8facc707 ("gpio: new driver to work with a 8x12 siox")
Cc: stable@vger.kernel.org
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpio/gpio-siox.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpio/gpio-siox.c
+++ b/drivers/gpio/gpio-siox.c
@@ -245,6 +245,7 @@ static int gpio_siox_probe(struct siox_d
 	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)