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authorThierry Reding <treding@nvidia.com>2017-11-07 21:15:59 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-11-08 16:24:51 +0300
commit959bc7b22bd25a3a907fbb9b26a1d0cbdf98ef40 (patch)
tree4fa59fb33b124369f71dc037e198775b26e08ea4 /drivers/gpio/gpiolib.c
parent8302cf585288f75fd253f6b9a094d51ae371a3f3 (diff)
downloadlinux-959bc7b22bd25a3a907fbb9b26a1d0cbdf98ef40.tar.xz
gpio: Automatically add lockdep keys
In order to avoid lockdep boilerplate in individual drivers, turn the gpiochip_add_data() function into a macro that creates a unique class key for each driver. Note that this has the slight disadvantage of adding a key for each driver registered with the system. However, these keys are 8 bytes in size, which is negligible and a small price to pay for generic infrastructure. Suggested-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Acked-by: Grygorii Strashko <grygorii.strashko@ti.com> [renane __gpiochip_add_data() to gpiochip_add_data_with_key] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
-rw-r--r--drivers/gpio/gpiolib.c41
1 files changed, 12 insertions, 29 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 6d5c366a1378..961b5da38bb9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -72,7 +72,8 @@ static LIST_HEAD(gpio_lookup_list);
LIST_HEAD(gpio_devices);
static void gpiochip_free_hogs(struct gpio_chip *chip);
-static int gpiochip_add_irqchip(struct gpio_chip *gpiochip);
+static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
+ struct lock_class_key *key);
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip);
static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip);
@@ -1098,30 +1099,8 @@ static void gpiochip_setup_devs(void)
}
}
-/**
- * gpiochip_add_data() - register a gpio_chip
- * @chip: the chip to register, with chip->base initialized
- * @data: driver-private data associated with this chip
- *
- * Context: potentially before irqs will work
- *
- * When gpiochip_add_data() is called very early during boot, so that GPIOs
- * can be freely used, the chip->parent device must be registered before
- * the gpio framework's arch_initcall(). Otherwise sysfs initialization
- * for GPIOs will fail rudely.
- *
- * gpiochip_add_data() must only be called after gpiolib initialization,
- * ie after core_initcall().
- *
- * If chip->base is negative, this requests dynamic assignment of
- * a range of valid GPIOs.
- *
- * Returns:
- * A negative errno if the chip can't be registered, such as because the
- * chip->base is invalid or already associated with a different chip.
- * Otherwise it returns zero as a success code.
- */
-int gpiochip_add_data(struct gpio_chip *chip, void *data)
+int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
+ struct lock_class_key *key)
{
unsigned long flags;
int status = 0;
@@ -1267,7 +1246,7 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data)
if (status)
goto err_remove_from_list;
- status = gpiochip_add_irqchip(chip);
+ status = gpiochip_add_irqchip(chip, key);
if (status)
goto err_remove_chip;
@@ -1314,7 +1293,7 @@ err_free_gdev:
kfree(gdev);
return status;
}
-EXPORT_SYMBOL_GPL(gpiochip_add_data);
+EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key);
/**
* gpiochip_get_data() - get per-subdriver data for the chip
@@ -1733,8 +1712,10 @@ static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
/**
* gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip
* @gpiochip: the GPIO chip to add the IRQ chip to
+ * @lock_key: lockdep class
*/
-static int gpiochip_add_irqchip(struct gpio_chip *gpiochip)
+static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
+ struct lock_class_key *lock_key)
{
struct irq_chip *irqchip = gpiochip->irq.chip;
const struct irq_domain_ops *ops;
@@ -1771,6 +1752,7 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip)
gpiochip->to_irq = gpiochip_to_irq;
gpiochip->irq.default_type = type;
+ gpiochip->irq.lock_key = lock_key;
if (gpiochip->irq.domain_ops)
ops = gpiochip->irq.domain_ops;
@@ -1957,7 +1939,8 @@ EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key);
#else /* CONFIG_GPIOLIB_IRQCHIP */
-static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip)
+static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
+ struct lock_dep_class *lock_key)
{
return 0;
}