pinmux: forbid mux_usecount to be set at UINT_MAX
If pin_free is called on a pin already freed, mux_usecount is set to UINT_MAX which is really a bad idea. This will issue a warning, so that we can correct the code responsible for the double free. Signed-off-by: Richard Genoud <richard.genoud@gmail.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -194,6 +194,11 @@ static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
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}
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if (!gpio_range) {
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/*
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* A pin should not be freed more times than allocated.
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*/
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if (WARN_ON(!desc->mux_usecount))
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return NULL;
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desc->mux_usecount--;
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if (desc->mux_usecount)
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return NULL;
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