diff options
Diffstat (limited to 'drivers/gpio/gpiolib.h')
| -rw-r--r-- | drivers/gpio/gpiolib.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 35d71e30c546..b3810f7d286a 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -63,7 +63,7 @@ struct gpio_device { int id; struct device *mockdev; struct module *owner; - struct gpio_chip *chip; + struct gpio_chip __rcu *chip; struct gpio_desc *descs; int base; u16 ngpio; @@ -193,6 +193,26 @@ struct gpio_desc { #define gpiod_not_found(desc) (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT) +struct gpio_chip_guard { + struct gpio_device *gdev; + struct gpio_chip *gc; + int idx; +}; + +DEFINE_CLASS(gpio_chip_guard, + struct gpio_chip_guard, + srcu_read_unlock(&_T.gdev->srcu, _T.idx), + ({ + struct gpio_chip_guard _guard; + + _guard.gdev = desc->gdev; + _guard.idx = srcu_read_lock(&_guard.gdev->srcu); + _guard.gc = rcu_dereference(_guard.gdev->chip); + + _guard; + }), + struct gpio_desc *desc) + int gpiod_request(struct gpio_desc *desc, const char *label); void gpiod_free(struct gpio_desc *desc); |