Add a function that allows initializing the valid_mask from gpiochip_add_data.
This prevents race conditions during gpiochip initialization. If the function is not exported, then the old behaviour is respected, this is, set all gpios as valid. Signed-off-by: Ricardo Ribalda Delgado <[email protected]> --- drivers/gpio/gpiolib.c | 3 +++ include/linux/gpio/driver.h | 7 ++++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index e8f8a1999393..6925196136ce 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -377,6 +377,9 @@ static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip) if (!gpiochip->valid_mask) return -ENOMEM; + if (gpiochip->init_valid_mask) + return gpiochip->init_valid_mask(gpiochip); + return 0; } diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 0ea328e71ec9..df09749269ff 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -256,6 +256,9 @@ struct gpio_chip { void (*dbg_show)(struct seq_file *s, struct gpio_chip *chip); + + int (*init_valid_mask)(struct gpio_chip *chip); + int base; u16 ngpio; const char *const *names; @@ -294,7 +297,9 @@ struct gpio_chip { /** * @need_valid_mask: * - * If set core allocates @valid_mask with all bits set to one. + * If set core allocates @valid_mask with all its values initialized + * with init_valid_mask() or set to one if init_valid_mask() is not + * defined */ bool need_valid_mask; -- 2.19.0
