[PATCH] hwmon: gpd-fan: Fix error handling in gpd_fan_probe()

[PATCH] hwmon: gpd-fan: Fix error handling in gpd_fan_probe()

[Harshit Mogalapalli]

When devm_request_region(0 fails to get a region regrion would be NULL
and devm_hwmon_device_register_with_info() fails, best to propagate
the hwmon dev to PTR_ERR() as opposed to region.

Fixes: 0ab88e239439 ("hwmon: add GPD devices sensor driver")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
---
This is based on static analysis with Smatch, only compile tested.
---
 drivers/hwmon/gpd-fan.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/gpd-fan.c b/drivers/hwmon/gpd-fan.c
index eebe39ef9677..321794807e8d 100644
--- a/drivers/hwmon/gpd-fan.c
+++ b/drivers/hwmon/gpd-fan.c
@@ -621,8 +621,8 @@ static int gpd_fan_probe(struct platform_device *pdev)
 
 	region = devm_request_region(dev, res->start,
 				     resource_size(res), DRIVER_NAME);
-	if (IS_ERR(region))
-		return dev_err_probe(dev, PTR_ERR(region),
+	if (!region)
+		return dev_err_probe(dev, -EBUSY,
 				     "Failed to request region\n");
 
 	hwdev = devm_hwmon_device_register_with_info(dev,
@@ -631,7 +631,7 @@ static int gpd_fan_probe(struct platform_device *pdev)
 						     &gpd_fan_chip_info,
 						     NULL);
 	if (IS_ERR(hwdev))
-		return dev_err_probe(dev, PTR_ERR(region),
+		return dev_err_probe(dev, PTR_ERR(hwdev),
 				     "Failed to register hwmon device\n");
 
 	return 0;
-- 
2.39.3

Re: [PATCH] hwmon: gpd-fan: Fix error handling in gpd_fan_probe()

[Cryolitia PukNgae]

On 11/10/2025 04.44, Harshit Mogalapalli wrote:
> When devm_request_region(0 fails to get a region regrion would be NULL
> and devm_hwmon_device_register_with_info() fails, best to propagate
> the hwmon dev to PTR_ERR() as opposed to region.
> 
> Fixes: 0ab88e239439 ("hwmon: add GPD devices sensor driver")
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
> ---
> This is based on static analysis with Smatch, only compile tested.
> ---
>  drivers/hwmon/gpd-fan.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hwmon/gpd-fan.c b/drivers/hwmon/gpd-fan.c
> index eebe39ef9677..321794807e8d 100644
> --- a/drivers/hwmon/gpd-fan.c
> +++ b/drivers/hwmon/gpd-fan.c
> @@ -621,8 +621,8 @@ static int gpd_fan_probe(struct platform_device *pdev)
>  
>  	region = devm_request_region(dev, res->start,
>  				     resource_size(res), DRIVER_NAME);
> -	if (IS_ERR(region))
> -		return dev_err_probe(dev, PTR_ERR(region),
> +	if (!region)
> +		return dev_err_probe(dev, -EBUSY,
>  				     "Failed to request region\n");
>  
>  	hwdev = devm_hwmon_device_register_with_info(dev,
> @@ -631,7 +631,7 @@ static int gpd_fan_probe(struct platform_device *pdev)
>  						     &gpd_fan_chip_info,
>  						     NULL);
>  	if (IS_ERR(hwdev))
> -		return dev_err_probe(dev, PTR_ERR(region),
> +		return dev_err_probe(dev, PTR_ERR(hwdev),
>  				     "Failed to register hwmon device\n");
>  
>  	return 0;

Reviewed-by: Cryolitia PukNgae <cryolitia@uniontech.com>

thx

Best regards
Cryolitia PukNgae

Re: [PATCH] hwmon: gpd-fan: Fix error handling in gpd_fan_probe()

[Markus Elfring]

> When devm_request_region(0 fails to get a region regrion would be NULL
> and devm_hwmon_device_register_with_info() fails, best to propagate
> the hwmon dev to PTR_ERR() as opposed to region.

Will another imperative wording approach become more helpful for an improved
change description?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.17#n94

Regards,
Markus

Re: [PATCH] hwmon: gpd-fan: Fix error handling in gpd_fan_probe()

[Guenter Roeck]

On Fri, Oct 10, 2025 at 01:44:46PM -0700, Harshit Mogalapalli wrote:
> When devm_request_region(0 fails to get a region regrion would be NULL
> and devm_hwmon_device_register_with_info() fails, best to propagate
> the hwmon dev to PTR_ERR() as opposed to region.
> 
> Fixes: 0ab88e239439 ("hwmon: add GPD devices sensor driver")
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
> Reviewed-by: Cryolitia PukNgae <cryolitia@uniontech.com>
> ---

Appied after updating the subject.

Thanks,
Guenter