gpio: of: Fix of_gpiochip_add() error path
If the call to of_gpiochip_scan_gpios() in of_gpiochip_add() fails, no
error handling is performed. This lead to the need of callers to call
of_gpiochip_remove() on failure, which causes "BAD of_node_put() on ..."
if the failure happened before the call to of_node_get().
Fix this by adding proper error handling.
Note that calling gpiochip_remove_pin_ranges() multiple times causes no
harm: subsequent calls are a no-op.
Fixes: dfbd379ba9b7431e ("gpio: of: Return error if gpio hog configuration failed")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 0220dd6..6a3ec57 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -718,7 +718,13 @@ int of_gpiochip_add(struct gpio_chip *chip)
of_node_get(chip->of_node);
- return of_gpiochip_scan_gpios(chip);
+ status = of_gpiochip_scan_gpios(chip);
+ if (status) {
+ of_node_put(chip->of_node);
+ gpiochip_remove_pin_ranges(chip);
+ }
+
+ return status;
}
void of_gpiochip_remove(struct gpio_chip *chip)
