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Date: Fri, 3 Jan 2020 22:36:59 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Johnson CH Chen (陳昭勳) <JohnsonCH.Chen@...a.com>, Johnson Chen <johnsonch.chen@...a.com>, Linus Walleij <linus.walleij@...aro.org>, Sasha Levin <sashal@...nel.org>, linux-gpio@...r.kernel.org Subject: [PATCH AUTOSEL 4.9 1/4] gpio: mpc8xxx: Add platform device to gpiochip->parent From: Johnson CH Chen (陳昭勳) <JohnsonCH.Chen@...a.com> [ Upstream commit 322f6a3182d42df18059a89c53b09d33919f755e ] Dear Linus Walleij, In old kernels, some APIs still try to use parent->of_node from struct gpio_chip, and it could be resulted in kernel panic because parent is NULL. Adding platform device to gpiochip->parent can fix this problem. Signed-off-by: Johnson Chen <johnsonch.chen@...a.com> Link: https://patchwork.kernel.org/patch/11234609 Link: https://lore.kernel.org/r/HK0PR01MB3521489269F76467DFD7843FFA450@HK0PR01MB3521.apcprd01.prod.exchangelabs.com Signed-off-by: Linus Walleij <linus.walleij@...aro.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/gpio/gpio-mpc8xxx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c index 793518a30afe..db8da96c5f97 100644 --- a/drivers/gpio/gpio-mpc8xxx.c +++ b/drivers/gpio/gpio-mpc8xxx.c @@ -306,6 +306,7 @@ static int mpc8xxx_probe(struct platform_device *pdev) return -ENOMEM; gc = &mpc8xxx_gc->gc; + gc->parent = &pdev->dev; if (of_property_read_bool(np, "little-endian")) { ret = bgpio_init(gc, &pdev->dev, 4, -- 2.20.1
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