From: Geert Uytterhoeven geert+renesas@glider.be
[ Upstream commit f7299d441a4da8a5088e651ea55023525a793a13 ]
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 Signed-off-by: Sasha Levin (Microsoft) sashal@kernel.org --- drivers/gpio/gpiolib-of.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index f1ae28289a67..13a402ede07a 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -712,7 +712,13 @@ 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)