[PATCH] regulator: gpio: properly check return value of of_get_named_gpio

[PATCH] regulator: gpio: properly check return value of of_get_named_gpio

[Jisheng Zhang]

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>
---
 drivers/regulator/gpio-regulator.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 83e89e5..0fce06a 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",
-- 
2.10.2

Applied "regulator: gpio: properly check return value of of_get_named_gpio" to the regulator tree

[Mark Brown]

The patch

   regulator: gpio: properly check return value of of_get_named_gpio

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 09f2ba0b0b7c44ecea49cf69a708203b76ba5535 Mon Sep 17 00:00:00 2001
From: Jisheng Zhang <jszhang@marvell.com>
Date: Thu, 10 Nov 2016 17:21:29 +0800
Subject: [PATCH] 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>
---
 drivers/regulator/gpio-regulator.c | 9 ++++++---
 1 file 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",
-- 
2.10.2