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regulator: gpio: check return value of of_get_named_gpio 

At boot time the regulator driver can be initialized before the
gpio, in which case the call to of_get_named_gpio will return
EPROBE_DEFER. This value is silently passed to regulator_register
which will return success, although the gpio is not registered
(regulator_ena_gpio_request not called) as the value passed is
detected as invalid. The gpio_regulator_probe will therefore
succeed win no gpio requested.

Signed-off-by: Mihai Mihalache <mihai.d.mihalache@intel.com>
Reviewed-by: Hans Holmberg <hans.holmberg@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mihai Mihalache 2016-03-16 08:21:12 -07:00 committed by Mark Brown
parent 768e66686c
commit 8d48794bb3
1 changed files with 2 additions and 0 deletions
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2
drivers/regulator/gpio-regulator.c
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@ -162,6 +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);
/* Fetch GPIOs. - optional property*/
ret = of_gpio_count(np);