Signed-off-by: Axel Lin <[email protected]>
---
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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