From c82064f26f44ea13f097dfb58d5ffd4359dcabbb Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 8 Nov 2016 14:40:06 +0100 Subject: [PATCH] ACPI / gpio: avoid warning for gpio hogging code MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The newly added acpi_gpiochip_scan_gpios function produces a few harmless warnings: drivers/gpio/gpiolib-acpi.c: In function ‘acpi_gpiochip_add’: drivers/gpio/gpiolib-acpi.c:925:7: error: ‘dflags’ may be used uninitialized in this function [-Werror=maybe-uninitialized] drivers/gpio/gpiolib-acpi.c:925:9: error: ‘lflags’ may be used uninitialized in this function [-Werror=maybe-uninitialized] The problem is that he compiler cannot know that a negative return value from fwnode_property_read_u32_array() or acpi_gpiochip_pin_to_gpio_offset() implies that the IS_ERR(gpio_desc) is true, as the value could in theory be below -MAX_ERRNO. The function already initializes its output values to zero, and moving that intialization a little higher up ensures that we can never have uninitialized data in the caller. Fixes: c80f1ba75df2 ("ACPI / gpio: Add hogging support") Signed-off-by: Arnd Bergmann Acked-by: Mika Westerberg Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib-acpi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 83fcfff19cd6..fec93b994fe9 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -866,6 +866,10 @@ static struct gpio_desc *acpi_gpiochip_parse_own_gpio( u32 gpios[2]; int ret; + *lflags = 0; + *dflags = 0; + *name = NULL; + ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios, ARRAY_SIZE(gpios)); if (ret < 0) @@ -879,10 +883,6 @@ static struct gpio_desc *acpi_gpiochip_parse_own_gpio( if (IS_ERR(desc)) return desc; - *lflags = 0; - *dflags = 0; - *name = NULL; - if (gpios[1]) *lflags |= GPIO_ACTIVE_LOW; -- 2.45.2