[PATCH] gnss: ubx: Use devm_regulator_get_enable_optional()

[PATCH] gnss: ubx: Use devm_regulator_get_enable_optional()

[Christophe JAILLET]

Use devm_regulator_get_enable_optional() instead of hand writing it. It
saves some line of code.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
Note that regulator_disable() is now called after gnss_serial_free() in
the error handling path of the probe and in the remove function, but it
looks harmless to me.
---
 drivers/gnss/ubx.c | 26 ++++----------------------
 1 file changed, 4 insertions(+), 22 deletions(-)

diff --git a/drivers/gnss/ubx.c b/drivers/gnss/ubx.c
index c951be202ca2..0ad2a10fc9a2 100644
--- a/drivers/gnss/ubx.c
+++ b/drivers/gnss/ubx.c
@@ -17,7 +17,6 @@
 #include "serial.h"
 
 struct ubx_data {
-	struct regulator *v_bckp;
 	struct regulator *vcc;
 };
 
@@ -87,30 +86,16 @@ static int ubx_probe(struct serdev_device *serdev)
 		goto err_free_gserial;
 	}
 
-	data->v_bckp = devm_regulator_get_optional(&serdev->dev, "v-bckp");
-	if (IS_ERR(data->v_bckp)) {
-		ret = PTR_ERR(data->v_bckp);
-		if (ret == -ENODEV)
-			data->v_bckp = NULL;
-		else
-			goto err_free_gserial;
-	}
-
-	if (data->v_bckp) {
-		ret = regulator_enable(data->v_bckp);
-		if (ret)
-			goto err_free_gserial;
-	}
+	ret = devm_regulator_get_enable_optional(&serdev->dev, "v-bckp");
+	if (ret)
+		goto err_free_gserial;
 
 	ret = gnss_serial_register(gserial);
 	if (ret)
-		goto err_disable_v_bckp;
+		goto err_free_gserial;
 
 	return 0;
 
-err_disable_v_bckp:
-	if (data->v_bckp)
-		regulator_disable(data->v_bckp);
 err_free_gserial:
 	gnss_serial_free(gserial);
 
@@ -120,11 +105,8 @@ static int ubx_probe(struct serdev_device *serdev)
 static void ubx_remove(struct serdev_device *serdev)
 {
 	struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);
-	struct ubx_data *data = gnss_serial_get_drvdata(gserial);
 
 	gnss_serial_deregister(gserial);
-	if (data->v_bckp)
-		regulator_disable(data->v_bckp);
 	gnss_serial_free(gserial);
 }
 
-- 
2.34.1

Re: [PATCH] gnss: ubx: Use devm_regulator_get_enable_optional()

[Johan Hovold]

On Sat, Jun 17, 2023 at 12:01:22PM +0200, Christophe JAILLET wrote:
> Use devm_regulator_get_enable_optional() instead of hand writing it. It
> saves some line of code.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
 
> -	data->v_bckp = devm_regulator_get_optional(&serdev->dev, "v-bckp");
> -	if (IS_ERR(data->v_bckp)) {
> -		ret = PTR_ERR(data->v_bckp);
> -		if (ret == -ENODEV)
> -			data->v_bckp = NULL;
> -		else
> -			goto err_free_gserial;
> -	}
> -
> -	if (data->v_bckp) {
> -		ret = regulator_enable(data->v_bckp);
> -		if (ret)
> -			goto err_free_gserial;
> -	}
> +	ret = devm_regulator_get_enable_optional(&serdev->dev, "v-bckp");
> +	if (ret)
> +		goto err_free_gserial;

Same here, this breaks the driver as -ENODEV is returned when the
optional resource is not present.

Johan