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gpio: mb86s70: Return error if requesting an already assigned gpio

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Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Axel Lin 2015-01-30 18:26:25 +08:00 • committed by Linus Walleij
commit fd9c963c56
1 changed files with 5 additions and 0 deletions
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5
drivers/gpio/gpio-mb86s7x.c
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@ -58,6 +58,11 @@ static int mb86s70_gpio_request(struct gpio_chip *gc, unsigned gpio)
spin_lock_irqsave(&gchip->lock, flags);
val = readl(gchip->base + PFR(gpio));
if (!(val & OFFSET(gpio))) {
spin_unlock_irqrestore(&gchip->lock, flags);
return -EINVAL;
}
val &= ~OFFSET(gpio);
writel(val, gchip->base + PFR(gpio));