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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: dfbd379ba9 ("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>
hifive-unleashed-5.1
Geert Uytterhoeven 2019-03-28 14:13:47 +01:00 committed by Linus Walleij
parent 7ce40277bf
commit f7299d441a
1 changed files with 7 additions and 1 deletions
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8
drivers/gpio/gpiolib-of.c
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@ -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)