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gpiolib: don't dereference a desc before validation
The fix restores a proper validation of an input gpio desc, which
might be needed to deal with optional GPIOs correctly.
Fixes: 02e479808b
("gpio: Alter semantics of *raw* operations to actually be raw")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
parent
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commit
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1 changed files with 2 additions and 1 deletions
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@ -2437,7 +2437,7 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
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*/
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int gpiod_direction_output(struct gpio_desc *desc, int value)
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{
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struct gpio_chip *gc = desc->gdev->chip;
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struct gpio_chip *gc;
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int ret;
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VALIDATE_DESC(desc);
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@ -2454,6 +2454,7 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
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return -EIO;
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}
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gc = desc->gdev->chip;
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if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
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/* First see if we can enable open drain in hardware */
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ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
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