In case we unload and load a driver module again that is registering a lookup table, without this it will result in multiple entries. Provide an option to remove the lookup table on driver unload
v2: Ccing maintainers
Cc: Samuel Ortiz sameo@linux.intel.com Cc: Linus Walleij linus.walleij@linaro.org Cc: Alexandre Courbot gnurou@gmail.com Cc: Thierry Reding thierry.reding@gmail.com Reviewed-by: Alexandre Courbot acourbot@nvidia.com Signed-off-by: Shobhit Kumar shobhit.kumar@intel.com --- drivers/gpio/gpiolib.c | 13 +++++++++++++ include/linux/gpio/machine.h | 1 + 2 files changed, 14 insertions(+)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 59eaa23..2420af9 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1658,6 +1658,19 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table) mutex_unlock(&gpio_lookup_lock); }
+/** + * gpiod_remove_lookup_table() - unregister GPIO device consumers + * @table: table of consumers to unregister + */ +void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) +{ + mutex_lock(&gpio_lookup_lock); + + list_del(&table->list); + + mutex_unlock(&gpio_lookup_lock); +} + static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, unsigned int idx, enum gpio_lookup_flags *flags) diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h index e270614..c0d712d 100644 --- a/include/linux/gpio/machine.h +++ b/include/linux/gpio/machine.h @@ -57,5 +57,6 @@ struct gpiod_lookup_table { }
void gpiod_add_lookup_table(struct gpiod_lookup_table *table); +void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
#endif /* __LINUX_GPIO_MACHINE_H */