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
v3: Correct the subject line (Lee jones)
Cc: Samuel Ortiz
Cc: Linus Walleij
Cc: Alexandre Courbot
Cc: Thierry Reding
Reviewed-by: Alexandre Courbot
Reviewed-by: Linus Walleij
Signed-off-by: Shobhit Kumar
---
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 957ede5..9d3ea4e 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1675,6 +1675,19 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table
*table)
mutex_unlock(_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(_lookup_lock);
+
+ list_del(>list);
+
+ mutex_unlock(_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 */
--
1.9.1
