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gpiolib: Preserve desc->flags when setting state

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desc->flags may already have values set by of_gpiochip_add() so make
sure that this isn't undone when setting the initial direction.

Cc: stable@vger.kernel.org
Fixes: 3edfb7bd76bd1cba ("gpiolib: Show correct direction from the beginning")
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20190707203558.10993-1-chris.packham@alliedtelesis.co.nz
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Chris Packham 2019-07-08 08:35:58 +12:00 committed by Linus Walleij
parent 238644ce4b
commit d95da99338
1 changed files with 11 additions and 6 deletions
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17
drivers/gpio/gpiolib.c
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@ -1394,12 +1394,17 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
for (i = 0; i < chip->ngpio; i++) {
struct gpio_desc *desc = &gdev->descs[i];
if (chip->get_direction && gpiochip_line_is_valid(chip, i))
desc->flags = !chip->get_direction(chip, i) ?
(1 << FLAG_IS_OUT) : 0;
else
desc->flags = !chip->direction_input ?
(1 << FLAG_IS_OUT) : 0;
if (chip->get_direction && gpiochip_line_is_valid(chip, i)) {
if (!chip->get_direction(chip, i))
set_bit(FLAG_IS_OUT, &desc->flags);
else
clear_bit(FLAG_IS_OUT, &desc->flags);
} else {
if (!chip->direction_input)
set_bit(FLAG_IS_OUT, &desc->flags);
else
clear_bit(FLAG_IS_OUT, &desc->flags);
}
}
acpi_gpiochip_add(chip);