[PATCH 5.4 038/142] gpio: tegra: mask GPIO IRQs during IRQ shutdown

From: Greg Kroah-Hartman
Date: Mon Jun 01 2020 - 14:08:27 EST

From: Stephen Warren <swarren@xxxxxxxxxx>

[ Upstream commit 0cf253eed5d2bdf7bb3152457b38f39b012955f7 ]

The driver currently leaves GPIO IRQs unmasked even when the GPIO IRQ
client has released the GPIO IRQ. This allows the HW to raise IRQs, and
SW to process them, after shutdown. Fix this by masking the IRQ when it's
shut down. This is usually taken care of by the irqchip core, but since
this driver has a custom irq_shutdown implementation, it must do this
explicitly itself.

Signed-off-by: Stephen Warren <swarren@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200427232605.11608-1-swarren@xxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/gpio/gpio-tegra.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index 8a01d3694b28..cecde5440a39 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -365,6 +365,7 @@ static void tegra_gpio_irq_shutdown(struct irq_data *d)
struct tegra_gpio_info *tgi = bank->tgi;
unsigned int gpio = d->hwirq;

+ tegra_gpio_irq_mask(d);
gpiochip_unlock_as_irq(&tgi->gc, gpio);