[PATCH] regulator: bq257xx: drop confusing configuration of_node

[PATCH] regulator: bq257xx: drop confusing configuration of_node

[Johan Hovold]

The driver reuses the OF node of the parent multi-function device but
still sets the of_node field of the regulator configuration to any prior
OF node.

Since the MFD child device does not have an OF node set until probe is
called, this field is set to NULL on first probe and to the reused OF
node if the driver is later rebound.

As the device_set_of_node_from_dev() helper drops a reference to any
prior OF node before taking a reference to the new one this can
apparently also confuse LLMs like Sashiko which flags it as a potential
use-after-free (which it is not).

Drop the confusing and redundant configuration of_node assignment.

Link: https://sashiko.dev/#/patchset/20260408073055.5183-1-johan%40kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
---

This is a follow-up to the reused OF node imbalance series:

	https://lore.kernel.org/lkml/20260408073055.5183-1-johan@kernel.org/

to address a false-positive Sashiko report.

Johan


 drivers/regulator/bq257xx-regulator.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/regulator/bq257xx-regulator.c b/drivers/regulator/bq257xx-regulator.c
index 711dbe045383..86225566e10a 100644
--- a/drivers/regulator/bq257xx-regulator.c
+++ b/drivers/regulator/bq257xx-regulator.c
@@ -139,7 +139,6 @@ static int bq257xx_regulator_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct bq257xx_device *bq = dev_get_drvdata(pdev->dev.parent);
 	struct bq257xx_reg_data *pdata;
-	struct device_node *np = dev->of_node;
 	struct regulator_config cfg = {};
 
 	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
@@ -156,7 +155,6 @@ static int bq257xx_regulator_probe(struct platform_device *pdev)
 
 	cfg.dev = &pdev->dev;
 	cfg.driver_data = pdata;
-	cfg.of_node = np;
 	cfg.regmap = dev_get_regmap(pdev->dev.parent, NULL);
 	if (!cfg.regmap)
 		return -ENODEV;
-- 
2.52.0

Re: [PATCH] regulator: bq257xx: drop confusing configuration of_node

[Mark Brown]

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On Wed, Apr 08, 2026 at 02:53:47PM +0200, Johan Hovold wrote:
> The driver reuses the OF node of the parent multi-function device but
> still sets the of_node field of the regulator configuration to any prior
> OF node.

Copying in Chris.

> Since the MFD child device does not have an OF node set until probe is
> called, this field is set to NULL on first probe and to the reused OF
> node if the driver is later rebound.
> 
> As the device_set_of_node_from_dev() helper drops a reference to any
> prior OF node before taking a reference to the new one this can
> apparently also confuse LLMs like Sashiko which flags it as a potential
> use-after-free (which it is not).
> 
> Drop the confusing and redundant configuration of_node assignment.
> 
> Link: https://sashiko.dev/#/patchset/20260408073055.5183-1-johan%40kernel.org
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
> 
> This is a follow-up to the reused OF node imbalance series:
> 
> 	https://lore.kernel.org/lkml/20260408073055.5183-1-johan@kernel.org/
> 
> to address a false-positive Sashiko report.
> 
> Johan
> 
> 
>  drivers/regulator/bq257xx-regulator.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/regulator/bq257xx-regulator.c b/drivers/regulator/bq257xx-regulator.c
> index 711dbe045383..86225566e10a 100644
> --- a/drivers/regulator/bq257xx-regulator.c
> +++ b/drivers/regulator/bq257xx-regulator.c
> @@ -139,7 +139,6 @@ static int bq257xx_regulator_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct bq257xx_device *bq = dev_get_drvdata(pdev->dev.parent);
>  	struct bq257xx_reg_data *pdata;
> -	struct device_node *np = dev->of_node;
>  	struct regulator_config cfg = {};
>  
>  	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
> @@ -156,7 +155,6 @@ static int bq257xx_regulator_probe(struct platform_device *pdev)
>  
>  	cfg.dev = &pdev->dev;
>  	cfg.driver_data = pdata;
> -	cfg.of_node = np;
>  	cfg.regmap = dev_get_regmap(pdev->dev.parent, NULL);
>  	if (!cfg.regmap)
>  		return -ENODEV;
> -- 
> 2.52.0
> 

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Re: [PATCH] regulator: bq257xx: drop confusing configuration of_node

[Mark Brown]

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On Wed, Apr 08, 2026 at 02:18:22PM +0100, Mark Brown wrote:
> On Wed, Apr 08, 2026 at 02:53:47PM +0200, Johan Hovold wrote:
> > The driver reuses the OF node of the parent multi-function device but
> > still sets the of_node field of the regulator configuration to any prior
> > OF node.
> 
> Copying in Chris.

Or not since hotmail is blocking kernel.org.

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