Commit b18537cd authored by Joachim Eastwood's avatar Joachim Eastwood Committed by Linus Walleij
Browse files

pinctrl: core: create nolock version of pinctrl_find_gpio_range_from_pin 



pinctrl_find_gpio_range_from_pin takes the pctldev->mutex but so
does pinconf_pins_show and this will cause a deadlock if
pinctrl_find_gpio_range_from_pin is used in .pin_config_get
callback.

Create a nolock version of pinctrl_find_gpio_range_from_pin to
allow pin to gpio lookup to be used from pinconf_pins_show.

Signed-off-by: default avatarJoachim Eastwood <manabian@gmail.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 5e9a2075

drivers/pinctrl/core.c

+23 −12
Original line number Diff line number Diff line
@@ -481,18 +481,12 @@ int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group, 
}

EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);



/**

 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin

 * @pctldev: the pin controller device to look in

 * @pin: a controller-local number to find the range for

 */

struct pinctrl_gpio_range *

pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,

pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,

					unsigned int pin)

{

	struct pinctrl_gpio_range *range;



	mutex_lock(&pctldev->mutex);

	/* Loop over the ranges */

	list_for_each_entry(range, &pctldev->gpio_ranges, node) {

		/* Check if we're in the valid range */
@@ -500,15 +494,32 @@ pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, 
			int a;

			for (a = 0; a < range->npins; a++) {

				if (range->pins[a] == pin)

					goto out;

					return range;

			}

		} else if (pin >= range->pin_base &&

			   pin < range->pin_base + range->npins)

			goto out;

			return range;

	}



	return NULL;

}

	range = NULL;

out:

EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock);



/**

 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin

 * @pctldev: the pin controller device to look in

 * @pin: a controller-local number to find the range for

 */

struct pinctrl_gpio_range *

pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,

				 unsigned int pin)

{

	struct pinctrl_gpio_range *range;



	mutex_lock(&pctldev->mutex);

	range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);

	mutex_unlock(&pctldev->mutex);



	return range;

}

EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);

drivers/pinctrl/core.h

+4 −0
Original line number Diff line number Diff line
@@ -182,6 +182,10 @@ static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, 
	return radix_tree_lookup(&pctldev->pin_desc_tree, pin);

}



extern struct pinctrl_gpio_range *

pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,

					unsigned int pin);



int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,

			 bool dup);

void pinctrl_unregister_map(struct pinctrl_map const *map);

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