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authorRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>2018-10-05 09:52:58 +0300
committerLinus Walleij <linus.walleij@linaro.org>2018-10-10 11:31:40 +0300
commitf8ec92a9f63b3b11e399409141b7868bb405e6b5 (patch)
treed1771589a157dc6bf83d67364a7c5dd64f8f1d69 /drivers/gpio
parent2505c7b0128f63289a59d77ee39cacd08aacf779 (diff)
downloadlinux-f8ec92a9f63b3b11e399409141b7868bb405e6b5.tar.xz
gpiolib: Add init_valid_mask exported function
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 <ricardo.ribalda@gmail.com> Tested-by: Jeffrey Hugo <jhugo@codeaurora.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 02660bf11189..b66aae75223b 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -360,7 +360,7 @@ static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip)
return p;
}
-static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip)
+static int gpiochip_alloc_valid_mask(struct gpio_chip *gpiochip)
{
#ifdef CONFIG_OF_GPIO
int size;
@@ -381,6 +381,14 @@ static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip)
return 0;
}
+static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip)
+{
+ if (gpiochip->init_valid_mask)
+ return gpiochip->init_valid_mask(gpiochip);
+
+ return 0;
+}
+
static void gpiochip_free_valid_mask(struct gpio_chip *gpiochip)
{
kfree(gpiochip->valid_mask);
@@ -1369,7 +1377,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
if (status)
goto err_remove_from_list;
- status = gpiochip_init_valid_mask(chip);
+ status = gpiochip_alloc_valid_mask(chip);
if (status)
goto err_remove_irqchip_mask;
@@ -1381,6 +1389,10 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
if (status)
goto err_remove_chip;
+ status = gpiochip_init_valid_mask(chip);
+ if (status)
+ goto err_remove_chip;
+
acpi_gpiochip_add(chip);
machine_gpiochip_add(chip);