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pinmux: forbid mux_usecount to be set at UINT_MAX

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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>
This commit is contained in:
Richard Genoud 2013-03-21 12:21:47 +01:00 committed by Linus Walleij
parent 48a23fac5e
commit 740924a267
1 changed files with 5 additions and 0 deletions
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5
drivers/pinctrl/pinmux.c
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@ -194,6 +194,11 @@ static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
}
if (!gpio_range) {
/*
* A pin should not be freed more times than allocated.
*/
if (WARN_ON(!desc->mux_usecount))
return NULL;
desc->mux_usecount--;
if (desc->mux_usecount)
return NULL;