diff options
| author |   Jisheng Zhang <jszhang@marvell.com> | 2016-11-10 17:21:29 +0800 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2016-11-11 15:38:08 +0000 |
| commit | 09f2ba0b0b7c44ecea49cf69a708203b76ba5535 (patch) | |
| tree | 042df33ac99f77d8b86ac427431e267c33561c35 /drivers/regulator/gpio-regulator.c | |
| parent | Linux 4.9-rc1 (diff) | |
| download | wireguard-linux-09f2ba0b0b7c44ecea49cf69a708203b76ba5535.tar.xz wireguard-linux-09f2ba0b0b7c44ecea49cf69a708203b76ba5535.zip | |
regulator: gpio: properly check return value of of_get_named_gpio
The function of_get_named_gpio() could return -ENOENT, -EPROBE_DEFER
-EINVAL and so on. Currently, for the optional property "enable-gpio",
we only check -EPROBE_DEFER, this is not enough since there may be
misconfigured "enable-gpio" in the DTB, of_get_named_gpio() will return
-EINVAL in this case, we should return immediately here. And for the
optional property "gpios", we didn't check the return value, the driver
will continue to the point where gpio_request_array() is called, it
doesn't make sense to continue if we got -EPROBE_DEFER or -EINVAL here.
This patch tries to address these two issues by properly checking the
return value of of_get_named_gpio.
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/gpio-regulator.c')
| -rw-r--r-- | drivers/regulator/gpio-regulator.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c index 83e89e5d4752..0fce06acfaec 100644 --- a/drivers/regulator/gpio-regulator.c +++ b/drivers/regulator/gpio-regulator.c @@ -162,8 +162,8 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np, of_property_read_u32(np, "startup-delay-us", &config->startup_delay); config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0); - if (config->enable_gpio == -EPROBE_DEFER) - return ERR_PTR(-EPROBE_DEFER); + if (config->enable_gpio < 0 && config->enable_gpio != -ENOENT) + return ERR_PTR(config->enable_gpio); /* Fetch GPIOs. - optional property*/ ret = of_gpio_count(np); @@ -190,8 +190,11 @@ of_get_gpio_regulator_config(struct device *dev, struct device_node *np, for (i = 0; i < config->nr_gpios; i++) { gpio = of_get_named_gpio(np, "gpios", i); - if (gpio < 0) + if (gpio < 0) { + if (gpio != -ENOENT) + return ERR_PTR(gpio); break; + } config->gpios[i].gpio = gpio; if (proplen > 0) { of_property_read_u32_index(np, "gpios-states", |