From: Marc Zyngier maz@kernel.org
commit d1e972ace42390de739cde87d96043dcbe502286 upstream.
The tegra186 GPIO driver makes the assumption that the pointer returned by irq_data_get_irq_chip_data() is a pointer to a tegra_gpio structure. Unfortunately, it is actually a pointer to the inner gpio_chip structure, as mandated by the gpiolib infrastructure. Nice try.
The saving grace is that the gpio_chip is the first member of tegra_gpio, so the bug has gone undetected since... forever.
Fix it by performing a container_of() on the pointer. This results in no additional code, and makes it possible to understand how the whole thing works.
Fixes: 5b2b135a87fc ("gpio: Add Tegra186 support") Signed-off-by: Marc Zyngier maz@kernel.org Cc: Thierry Reding treding@nvidia.com Cc: Linus Walleij linus.walleij@linaro.org Cc: Bartosz Golaszewski bgolaszewski@baylibre.com Link: https://lore.kernel.org/r/20220211093904.1112679-1-maz@kernel.org Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpio/gpio-tegra186.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
--- a/drivers/gpio/gpio-tegra186.c +++ b/drivers/gpio/gpio-tegra186.c @@ -341,9 +341,12 @@ static int tegra186_gpio_of_xlate(struct return offset + pin; }
+#define to_tegra_gpio(x) container_of((x), struct tegra_gpio, gpio) + static void tegra186_irq_ack(struct irq_data *data) { - struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data); + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + struct tegra_gpio *gpio = to_tegra_gpio(gc); void __iomem *base;
base = tegra186_gpio_get_base(gpio, data->hwirq); @@ -355,7 +358,8 @@ static void tegra186_irq_ack(struct irq_
static void tegra186_irq_mask(struct irq_data *data) { - struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data); + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + struct tegra_gpio *gpio = to_tegra_gpio(gc); void __iomem *base; u32 value;
@@ -370,7 +374,8 @@ static void tegra186_irq_mask(struct irq
static void tegra186_irq_unmask(struct irq_data *data) { - struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data); + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + struct tegra_gpio *gpio = to_tegra_gpio(gc); void __iomem *base; u32 value;
@@ -385,7 +390,8 @@ static void tegra186_irq_unmask(struct i
static int tegra186_irq_set_type(struct irq_data *data, unsigned int type) { - struct tegra_gpio *gpio = irq_data_get_irq_chip_data(data); + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + struct tegra_gpio *gpio = to_tegra_gpio(gc); void __iomem *base; u32 value;