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pinctrl: core: create nolock version of pinctrl_find_gpio_range_from_pin

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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: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Joachim Eastwood
2016-02-25 22:44:37 +01:00
committed by Linus Walleij
parent 5e9a207547
commit b18537cd8e
2 changed files with 30 additions and 15 deletions
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4
drivers/pinctrl/core.h
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@@ -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);