Merge tag 'gpio-fixes-for-v6.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:

 - fix a regression in pin access control in gpio-tegra186

 - make data pointer dereference robust in Intel Tangier driver

* tag 'gpio-fixes-for-v6.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpio: tegra186: Fix tegra186_gpio_is_accessible() check
  gpio: tangier: Use correct type for the IRQ chip data

Author: torvalds

drivers/gpio/gpio-tangier.c

@@ -195,7 +195,8 @@ static int tng_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 
 static void tng_irq_ack(struct irq_data *d)
 {
-	struct tng_gpio *priv = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct tng_gpio *priv = gpiochip_get_data(gc);
 	irq_hw_number_t gpio = irqd_to_hwirq(d);
 	void __iomem *gisr;
 	u8 shift;
@@ -227,7 +228,8 @@ static void tng_irq_unmask_mask(struct tng_gpio *priv, u32 gpio, bool unmask)
 
 static void tng_irq_mask(struct irq_data *d)
 {
-	struct tng_gpio *priv = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct tng_gpio *priv = gpiochip_get_data(gc);
 	irq_hw_number_t gpio = irqd_to_hwirq(d);
 
 	tng_irq_unmask_mask(priv, gpio, false);
@@ -236,7 +238,8 @@ static void tng_irq_mask(struct irq_data *d)
 
 static void tng_irq_unmask(struct irq_data *d)
 {
-	struct tng_gpio *priv = irq_data_get_irq_chip_data(d);
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+	struct tng_gpio *priv = gpiochip_get_data(gc);
 	irq_hw_number_t gpio = irqd_to_hwirq(d);
 
 	gpiochip_enable_irq(&priv->chip, gpio);

drivers/gpio/gpio-tegra186.c

@@ -36,12 +36,6 @@
 #define  TEGRA186_GPIO_SCR_SEC_REN		BIT(27)
 #define  TEGRA186_GPIO_SCR_SEC_G1W		BIT(9)
 #define  TEGRA186_GPIO_SCR_SEC_G1R		BIT(1)
-#define  TEGRA186_GPIO_FULL_ACCESS		(TEGRA186_GPIO_SCR_SEC_WEN | \
-						 TEGRA186_GPIO_SCR_SEC_REN | \
-						 TEGRA186_GPIO_SCR_SEC_G1R | \
-						 TEGRA186_GPIO_SCR_SEC_G1W)
-#define  TEGRA186_GPIO_SCR_SEC_ENABLE		(TEGRA186_GPIO_SCR_SEC_WEN | \
-						 TEGRA186_GPIO_SCR_SEC_REN)
 
 /* control registers */
 #define TEGRA186_GPIO_ENABLE_CONFIG 0x00
@@ -177,10 +171,18 @@ static inline bool tegra186_gpio_is_accessible(struct tegra_gpio *gpio, unsigned
 
 	value = __raw_readl(secure + TEGRA186_GPIO_SCR);
 
-	if ((value & TEGRA186_GPIO_SCR_SEC_ENABLE) == 0)
-		return true;
+	/*
+	 * When SCR_SEC_[R|W]EN is unset, then we have full read/write access to all the
+	 * registers for given GPIO pin.
+	 * When SCR_SEC[R|W]EN is set, then there is need to further check the accompanying
+	 * SCR_SEC_G1[R|W] bit to determine read/write access to all the registers for given
+	 * GPIO pin.
+	 */
 
-	if ((value & TEGRA186_GPIO_FULL_ACCESS) == TEGRA186_GPIO_FULL_ACCESS)
+	if (((value & TEGRA186_GPIO_SCR_SEC_REN) == 0 ||
+	     ((value & TEGRA186_GPIO_SCR_SEC_REN) && (value & TEGRA186_GPIO_SCR_SEC_G1R))) &&
+	     ((value & TEGRA186_GPIO_SCR_SEC_WEN) == 0 ||
+	     ((value & TEGRA186_GPIO_SCR_SEC_WEN) && (value & TEGRA186_GPIO_SCR_SEC_G1W))))
 		return true;
 
 	return false;