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gpio: sysfs: Obey valid_mask
[ Upstream commit23cf00ddd2
] Do not allow exporting GPIOs which are set invalid by the driver's valid mask. Fixes:726cb3ba49
("gpiolib: Support 'gpio-reserved-ranges' property") Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 8 additions and 0 deletions
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@ -457,6 +457,8 @@ static ssize_t export_store(struct class *class,
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long gpio;
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struct gpio_desc *desc;
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int status;
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struct gpio_chip *gc;
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int offset;
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status = kstrtol(buf, 0, &gpio);
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if (status < 0)
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@ -468,6 +470,12 @@ static ssize_t export_store(struct class *class,
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pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
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return -EINVAL;
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}
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gc = desc->gdev->chip;
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offset = gpio_chip_hwgpio(desc);
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if (!gpiochip_line_is_valid(gc, offset)) {
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pr_warn("%s: GPIO %ld masked\n", __func__, gpio);
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return -EINVAL;
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}
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/* No extra locking here; FLAG_SYSFS just signifies that the
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* request and export were done by on behalf of userspace, so
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