diff options
| author | Vladimir Zapolskiy <vz@mleia.com> | 2017-12-21 19:37:24 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-01-02 11:31:20 +0300 |
| commit | 30322bcf82d74cad0d6e1cf9ba7fa7fa48c7a026 (patch) | |
| tree | f46a497daef538e4bce3a9491db6dedbb9a1e8bf /drivers/gpio/gpiolib.c | |
| parent | fe13862c9cad6f7d7d4faa97f546eb94d4989f44 (diff) | |
| download | linux-30322bcf82d74cad0d6e1cf9ba7fa7fa48c7a026.tar.xz | |
gpiolib: don't dereference a desc before validation
The fix restores a proper validation of an input gpio desc, which
might be needed to deal with optional GPIOs correctly.
Fixes: 02e479808b5d ("gpio: Alter semantics of *raw* operations to actually be raw")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 0ae49943dfaf..02cf658eeedd 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2437,7 +2437,7 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); */ int gpiod_direction_output(struct gpio_desc *desc, int value) { - struct gpio_chip *gc = desc->gdev->chip; + struct gpio_chip *gc; int ret; VALIDATE_DESC(desc); @@ -2454,6 +2454,7 @@ int gpiod_direction_output(struct gpio_desc *desc, int value) return -EIO; } + gc = desc->gdev->chip; if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { /* First see if we can enable open drain in hardware */ ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), |