[PATCH 6.0 0978/1073] regulator: core: Fix resolve supply lookup issue

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>

[ Upstream commit 0debed5b117d11e33cba52870c4dcb64f5911891 ]

>From Marek's log, the previous change modify the parent of rdev.
https://lore.kernel.org/all/58b92e75-f373-dae7-7031-8abd465bb874@xxxxxxxxxxx/

In 'regulator_resolve_supply', it uses the parent DT node of rdev as the
DT-lookup starting node. But the parent DT node may not exist. This will
cause the NULL supply issue.

This patch modify the parent of rdev back to the device that provides
from 'regulator_config' in 'regulator_register'.

Fixes: 8f3cbcd6b440 ("regulator: core: Use different devices for resource allocation and DT lookup")
Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/1670981831-12583-1-git-send-email-u0084500@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/regulator/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c095ca9f01e8..93da2b4cbc72 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -5531,7 +5531,7 @@ regulator_register(struct device *dev,
 
 	/* register with sysfs */
 	rdev->dev.class = &regulator_class;
-	rdev->dev.parent = dev;
+	rdev->dev.parent = config->dev;
 	dev_set_name(&rdev->dev, "regulator.%lu",
 		    (unsigned long) atomic_inc_return(&regulator_no));
 	dev_set_drvdata(&rdev->dev, rdev);
-- 
2.35.1