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Subject[PATCH v5 1/3] gpiolib: Add init_valid_mask exported function
Date
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>
---
drivers/gpio/gpiolib.c | 16 ++++++++++++++--
include/linux/gpio/driver.h | 7 ++++++-
2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8f8a1999393..907019b67a58 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -359,7 +359,7 @@ 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;
@@ -380,6 +380,14 @@ 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);
@@ -1367,7 +1375,7 @@ 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;

@@ -1379,6 +1387,10 @@ 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);
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
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