diff options
author | Lars-Peter Clausen <lars@metafoo.de> | 2016-07-01 17:40:09 +0200 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2016-07-06 14:39:50 +0200 |
commit | da17f8a11378917a97019be33fed35893b7b7e1a (patch) | |
tree | 3935610e2e5e78a01d9c5dea10fd9948150ef244 /drivers/gpio/gpiolib.c | |
parent | acc6e331b62275570d23b20ced6296812023967f (diff) | |
download | linux-da17f8a11378917a97019be33fed35893b7b7e1a.tar.gz |
gpiolib: of_find_gpio(): Don't discard errors
Since commit dd34c37aa3e8 ("gpio: of: Allow -gpio suffix for property names") when requesting a GPIO from the devicetree gpiolib looks for properties with both the '-gpio' and the '-gpios' suffix. This was implemented by first searching for the property with the '-gpios' suffix and if that yields an error try the '-gpio' suffix. This approach has the issue that any error returned when looking for the '-gpios' suffix is silently discarded. Commit 06fc3b70f1dc ("gpio: of: Fix handling for deferred probe for -gpio suffix") partially addressed the issue by treating the EPROBE_DEFER error as a special condition. This fixed the case when the property is specified, but the GPIO provider is not ready yet. But there are other cases in which of_get_named_gpiod_flags() returns an error even though the property is specified, e.g. if the specification is incorrect. of_find_gpio() should only try to look for the property with the '-gpio' suffix if no property with the '-gpios' suffix was found. If the property was not found of_get_named_gpiod_flags() will return -ENOENT, so update the condition to abort and propagate the error to the caller in all other cases. This is important for gpiod_get_optinal() and friends to behave correctly in case the specifier contains errors. Without this patch they'll return NULL if the property uses the '-gpios' suffix and the specifier contains errors, which falsely indicates to the caller that no GPIO was specified. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
-rw-r--r-- | drivers/gpio/gpiolib.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 6dc3917a9e1d..5b0f4545f61b 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2845,7 +2845,7 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, &of_flags); - if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) + if (!IS_ERR(desc) || (PTR_ERR(desc) != -ENOENT)) break; } |