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Date: Thu, 2 May 2019 17:21:32 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Geert Uytterhoeven <geert+renesas@...der.be>, Mukesh Ojha <mojha@...eaurora.org>, Linus Walleij <linus.walleij@...aro.org>, "Sasha Levin (Microsoft)" <sashal@...nel.org> Subject: [PATCH 5.0 090/101] gpio: of: Fix of_gpiochip_add() error path [ 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@...der.be> Reviewed-by: Mukesh Ojha <mojha@...eaurora.org> Signed-off-by: Linus Walleij <linus.walleij@...aro.org> Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.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) -- 2.19.1
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