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gpio: tegra186: Fix chip_data type confusion

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commit d1e972ace4 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: 5b2b135a87 ("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>
This commit is contained in:
Marc Zyngier 2022-02-11 09:39:04 +00:00 committed by Greg Kroah-Hartman
parent 2782b05d02
commit 1fb051bbbc
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/gpio/gpio-tegra186.c
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@ -234,9 +234,12 @@ static int tegra186_gpio_of_xlate(struct gpio_chip *chip,
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);
@ -248,7 +251,8 @@ static void tegra186_irq_ack(struct irq_data *data)
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;
@ -263,7 +267,8 @@ static void tegra186_irq_mask(struct irq_data *data)
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;
@ -278,7 +283,8 @@ static void tegra186_irq_unmask(struct irq_data *data)
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;