[PATCH RFT] gpio: mb86s70: Return error if requesting an already assigned gpio

[Axel Lin <axel.lin@xxxxxxxxxx>]

Signed-off-by: Axel Lin <axel.lin@xxxxxxxxxx>
---
 drivers/gpio/gpio-mb86s7x.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpio/gpio-mb86s7x.c b/drivers/gpio/gpio-mb86s7x.c
index 21b1ce5..ee93c0a 100644
--- a/drivers/gpio/gpio-mb86s7x.c
+++ b/drivers/gpio/gpio-mb86s7x.c
@@ -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));
 
-- 
1.9.1



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