diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2016-11-08 14:40:06 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-11-09 09:43:55 +0100 |
| commit | c82064f26f44ea13f097dfb58d5ffd4359dcabbb (patch) | |
| tree | 731092773f6c54fbb6d4478e4cf670089d9e3b02 /drivers/gpio | |
| parent | e0275034ad94c413090bab4bf65ccb70906725ed (diff) | |
ACPI / gpio: avoid warning for gpio hogging code
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 <arnd@arndb.de>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-acpi.c | 8 |
1 files 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; |