[PATCH] gpiolib: change gpio pin from unsigned to signed in acpi callback

["qipeng.zha" <qipeng.zha@xxxxxxxxx>]

From: "qipeng.zha" <qipeng.zha@xxxxxxxxx>

The signed error will be wrongly used as valid gpio offset

Reported-by: David Binderman <dcb314@xxxxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
Signed-off-by: qipeng.zha <qipeng.zha@xxxxxxxxx>
---
 drivers/gpio/gpiolib-acpi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index df990f2..9674066 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -550,7 +550,7 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
 
 	length = min(agpio->pin_table_length, (u16)(pin_index + bits));
 	for (i = pin_index; i < length; ++i) {
-		unsigned pin = agpio->pin_table[i];
+		int pin = agpio->pin_table[i];
 		struct acpi_gpio_connection *conn;
 		struct gpio_desc *desc;
 		bool found;
-- 
1.8.3.2

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