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authorWaibel Georg <Georg.Waibel@sensor-technik.de>2019-06-21 00:37:08 +0300
committerMark Brown <broonie@kernel.org>2019-06-25 17:26:24 +0300
commit025bf37725f1929542361eef2245df30badf242e (patch)
treeabc73cfad4cc36287feb2cec37f69794ee1623d9 /drivers/regulator/s2mps11.c
parent65d80db2ee92330269e90313c6af782036f4d23d (diff)
downloadlinux-025bf37725f1929542361eef2245df30badf242e.tar.xz
gpio: Fix return value mismatch of function gpiod_get_from_of_node()
In case the requested gpio property is not found in the device tree, some callers of gpiod_get_from_of_node() expect a return value of NULL, others expect -ENOENT. In particular devm_fwnode_get_index_gpiod_from_child() expects -ENOENT. Currently it gets a NULL, which breaks the loop that tries all gpio_suffixes. The result is that a gpio property is not found, even though it is there. This patch changes gpiod_get_from_of_node() to return -ENOENT instead of NULL when the requested gpio property is not found in the device tree. Additionally it modifies all calling functions to properly evaluate the return value. Another approach would be to leave the return value of gpiod_get_from_of_node() as is and fix the bug in devm_fwnode_get_index_gpiod_from_child(). Other callers would still need to be reworked. The effort would be the same as with the chosen solution. Signed-off-by: Georg Waibel <georg.waibel@sensor-technik.de> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/s2mps11.c')
-rw-r--r--drivers/regulator/s2mps11.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c
index 9c06ecd80a90..e5a74ae40687 100644
--- a/drivers/regulator/s2mps11.c
+++ b/drivers/regulator/s2mps11.c
@@ -843,7 +843,9 @@ static void s2mps14_pmic_dt_parse_ext_control_gpio(struct platform_device *pdev,
0,
GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE,
"s2mps11-regulator");
- if (IS_ERR(gpio[reg])) {
+ if (PTR_ERR(gpio[reg]) == -ENOENT)
+ gpio[reg] = NULL;
+ else if (IS_ERR(gpio[reg])) {
dev_err(&pdev->dev, "Failed to get control GPIO for %d/%s\n",
reg, rdata[reg].name);
continue;