[PATCH 0/7] extcon: Convert to platform remove callback returning void

[PATCH 0/7] extcon: Convert to platform remove callback returning void

[Uwe Kleine-König]

Hello,

this series converts all drivers below drivers/extcon to struct
platform_driver::remove_new(). See commit 5c5a7680e67b ("platform:
Provide a remove callback that returns no value") for an extended
explanation and the eventual goal.

All conversations are trivial, because their .remove() callbacks
returned zero unconditionally.

There are no interdependencies between these patches, so they could be
picked up individually. But I'd hope that they get picked up all
together by the extcon maintainer team.

Best regards
Uwe

Uwe Kleine-König (7):
  extcon: adc-jack: Convert to platform remove callback returning void
  extcon: intel-cht-wc: Convert to platform remove callback returning void
  extcon: intel-mrfld: Convert to platform remove callback returning void
  extcon: max3355: Convert to platform remove callback returning void
  extcon: max77843: Convert to platform remove callback returning void
  extcon: usb-gpio: Convert to platform remove callback returning void
  extcon: usbc-cros-ec: Convert to platform remove callback returning void

 drivers/extcon/extcon-adc-jack.c     | 6 ++----
 drivers/extcon/extcon-intel-cht-wc.c | 6 ++----
 drivers/extcon/extcon-intel-mrfld.c  | 6 ++----
 drivers/extcon/extcon-max3355.c      | 6 ++----
 drivers/extcon/extcon-max77843.c     | 6 ++----
 drivers/extcon/extcon-usb-gpio.c     | 6 ++----
 drivers/extcon/extcon-usbc-cros-ec.c | 6 ++----
 7 files changed, 14 insertions(+), 28 deletions(-)

base-commit: 33e1d31873f87d119e5120b88cd350efa68ef276
-- 
2.43.0

[PATCH 1/7] extcon: adc-jack: Convert to platform remove callback returning void

[Uwe Kleine-König]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/extcon/extcon-adc-jack.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
index 0317b614b680..cf5050a244b2 100644
--- a/drivers/extcon/extcon-adc-jack.c
+++ b/drivers/extcon/extcon-adc-jack.c
@@ -158,14 +158,12 @@ static int adc_jack_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int adc_jack_remove(struct platform_device *pdev)
+static void adc_jack_remove(struct platform_device *pdev)
 {
 	struct adc_jack_data *data = platform_get_drvdata(pdev);
 
 	free_irq(data->irq, data);
 	cancel_work_sync(&data->handler.work);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -196,7 +194,7 @@ static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
 
 static struct platform_driver adc_jack_driver = {
 	.probe          = adc_jack_probe,
-	.remove         = adc_jack_remove,
+	.remove_new     = adc_jack_remove,
 	.driver         = {
 		.name   = "adc-jack",
 		.pm = &adc_jack_pm_ops,
-- 
2.43.0

[PATCH 2/7] extcon: intel-cht-wc: Convert to platform remove callback returning void

[Uwe Kleine-König]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/extcon/extcon-intel-cht-wc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c
index 2c55f06ba699..733c470c3102 100644
--- a/drivers/extcon/extcon-intel-cht-wc.c
+++ b/drivers/extcon/extcon-intel-cht-wc.c
@@ -617,13 +617,11 @@ static int cht_wc_extcon_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int cht_wc_extcon_remove(struct platform_device *pdev)
+static void cht_wc_extcon_remove(struct platform_device *pdev)
 {
 	struct cht_wc_extcon_data *ext = platform_get_drvdata(pdev);
 
 	cht_wc_extcon_sw_control(ext, false);
-
-	return 0;
 }
 
 static const struct platform_device_id cht_wc_extcon_table[] = {
@@ -634,7 +632,7 @@ MODULE_DEVICE_TABLE(platform, cht_wc_extcon_table);
 
 static struct platform_driver cht_wc_extcon_driver = {
 	.probe = cht_wc_extcon_probe,
-	.remove = cht_wc_extcon_remove,
+	.remove_new = cht_wc_extcon_remove,
 	.id_table = cht_wc_extcon_table,
 	.driver = {
 		.name = "cht_wcove_pwrsrc",
-- 
2.43.0

[PATCH 3/7] extcon: intel-mrfld: Convert to platform remove callback returning void

[Uwe Kleine-König]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/extcon/extcon-intel-mrfld.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-intel-mrfld.c b/drivers/extcon/extcon-intel-mrfld.c
index e96947fb76ee..12a041a58578 100644
--- a/drivers/extcon/extcon-intel-mrfld.c
+++ b/drivers/extcon/extcon-intel-mrfld.c
@@ -257,13 +257,11 @@ static int mrfld_extcon_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int mrfld_extcon_remove(struct platform_device *pdev)
+static void mrfld_extcon_remove(struct platform_device *pdev)
 {
 	struct mrfld_extcon_data *data = platform_get_drvdata(pdev);
 
 	mrfld_extcon_sw_control(data, false);
-
-	return 0;
 }
 
 static const struct platform_device_id mrfld_extcon_id_table[] = {
@@ -277,7 +275,7 @@ static struct platform_driver mrfld_extcon_driver = {
 		.name	= "mrfld_bcove_pwrsrc",
 	},
 	.probe		= mrfld_extcon_probe,
-	.remove		= mrfld_extcon_remove,
+	.remove_new	= mrfld_extcon_remove,
 	.id_table	= mrfld_extcon_id_table,
 };
 module_platform_driver(mrfld_extcon_driver);
-- 
2.43.0

[PATCH 4/7] extcon: max3355: Convert to platform remove callback returning void

[Uwe Kleine-König]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/extcon/extcon-max3355.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-max3355.c b/drivers/extcon/extcon-max3355.c
index d7795607f693..e62ce7a8d131 100644
--- a/drivers/extcon/extcon-max3355.c
+++ b/drivers/extcon/extcon-max3355.c
@@ -112,13 +112,11 @@ static int max3355_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int max3355_remove(struct platform_device *pdev)
+static void max3355_remove(struct platform_device *pdev)
 {
 	struct max3355_data *data = platform_get_drvdata(pdev);
 
 	gpiod_set_value_cansleep(data->shdn_gpiod, 0);
-
-	return 0;
 }
 
 static const struct of_device_id max3355_match_table[] = {
@@ -129,7 +127,7 @@ MODULE_DEVICE_TABLE(of, max3355_match_table);
 
 static struct platform_driver max3355_driver = {
 	.probe		= max3355_probe,
-	.remove		= max3355_remove,
+	.remove_new	= max3355_remove,
 	.driver		= {
 		.name	= "extcon-max3355",
 		.of_match_table = max3355_match_table,
-- 
2.43.0

[PATCH 5/7] extcon: max77843: Convert to platform remove callback returning void

[Uwe Kleine-König]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/extcon/extcon-max77843.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-max77843.c b/drivers/extcon/extcon-max77843.c
index acb11a54f875..9849e3b8327e 100644
--- a/drivers/extcon/extcon-max77843.c
+++ b/drivers/extcon/extcon-max77843.c
@@ -928,7 +928,7 @@ static int max77843_muic_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int max77843_muic_remove(struct platform_device *pdev)
+static void max77843_muic_remove(struct platform_device *pdev)
 {
 	struct max77843_muic_info *info = platform_get_drvdata(pdev);
 	struct max77693_dev *max77843 = info->max77843;
@@ -936,8 +936,6 @@ static int max77843_muic_remove(struct platform_device *pdev)
 	cancel_work_sync(&info->irq_work);
 	regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 	i2c_unregister_device(max77843->i2c_muic);
-
-	return 0;
 }
 
 static const struct platform_device_id max77843_muic_id[] = {
@@ -958,7 +956,7 @@ static struct platform_driver max77843_muic_driver = {
 		.of_match_table = of_max77843_muic_dt_match,
 	},
 	.probe		= max77843_muic_probe,
-	.remove		= max77843_muic_remove,
+	.remove_new	= max77843_muic_remove,
 	.id_table	= max77843_muic_id,
 };
 
-- 
2.43.0

[PATCH 6/7] extcon: usb-gpio: Convert to platform remove callback returning void

[Uwe Kleine-König]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/extcon/extcon-usb-gpio.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
index 40d967a11e87..9b61eb99b7dc 100644
--- a/drivers/extcon/extcon-usb-gpio.c
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -193,14 +193,12 @@ static int usb_extcon_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int usb_extcon_remove(struct platform_device *pdev)
+static void usb_extcon_remove(struct platform_device *pdev)
 {
 	struct usb_extcon_info *info = platform_get_drvdata(pdev);
 
 	cancel_delayed_work_sync(&info->wq_detcable);
 	device_init_wakeup(&pdev->dev, false);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -281,7 +279,7 @@ MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids);
 
 static struct platform_driver usb_extcon_driver = {
 	.probe		= usb_extcon_probe,
-	.remove		= usb_extcon_remove,
+	.remove_new	= usb_extcon_remove,
 	.driver		= {
 		.name	= "extcon-usb-gpio",
 		.pm	= &usb_extcon_pm_ops,
-- 
2.43.0

[PATCH 7/7] extcon: usbc-cros-ec: Convert to platform remove callback returning void

[Uwe Kleine-König]

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/extcon/extcon-usbc-cros-ec.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-usbc-cros-ec.c b/drivers/extcon/extcon-usbc-cros-ec.c
index fde1db62be0d..805a47230689 100644
--- a/drivers/extcon/extcon-usbc-cros-ec.c
+++ b/drivers/extcon/extcon-usbc-cros-ec.c
@@ -480,14 +480,12 @@ static int extcon_cros_ec_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int extcon_cros_ec_remove(struct platform_device *pdev)
+static void extcon_cros_ec_remove(struct platform_device *pdev)
 {
 	struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
 
 	blocking_notifier_chain_unregister(&info->ec->event_notifier,
 					   &info->notifier);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -531,7 +529,7 @@ static struct platform_driver extcon_cros_ec_driver = {
 		.of_match_table = of_match_ptr(extcon_cros_ec_of_match),
 		.pm = DEV_PM_OPS,
 	},
-	.remove  = extcon_cros_ec_remove,
+	.remove_new = extcon_cros_ec_remove,
 	.probe   = extcon_cros_ec_probe,
 };
 
-- 
2.43.0

Re: [PATCH 7/7] extcon: usbc-cros-ec: Convert to platform remove callback returning void

[Tzung-Bi Shih]

On Sun, Feb 25, 2024 at 04:54:56PM +0100, Uwe Kleine-König wrote:
> The .remove() callback for a platform driver returns an int which makes
> many driver authors wrongly assume it's possible to do error handling by
> returning an error code. However the value returned is ignored (apart
> from emitting a warning) and this typically results in resource leaks.
> 
> To improve here there is a quest to make the remove callback return
> void. In the first step of this quest all drivers are converted to
> .remove_new(), which already returns void. Eventually after all drivers
> are converted, .remove_new() will be renamed to .remove().
> 
> Trivially convert this driver from always returning zero in the remove
> callback to the void returning variant.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>

RE: [PATCH 0/7] extcon: Convert to platform remove callback returning void

[Chanwoo Choi]

> -----Original Message-----
> From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Sent: Monday, February 26, 2024 12:55 AM
> To: MyungJoo Ham <myungjoo.ham@samsung.com>; Chanwoo Choi
> <cw00.choi@samsung.com>
> Cc: linux-kernel@vger.kernel.org; Krzysztof Kozlowski
> <krzysztof.kozlowski@linaro.org>; Benson Leung <bleung@chromium.org>; Guenter
> Roeck <groeck@chromium.org>; chrome-platform@lists.linux.dev
> Subject: [PATCH 0/7] extcon: Convert to platform remove callback returning
> void
> 
> Hello,
> 
> this series converts all drivers below drivers/extcon to struct
> platform_driver::remove_new(). See commit 5c5a7680e67b ("platform:
> Provide a remove callback that returns no value") for an extended explanation
> and the eventual goal.
> 
> All conversations are trivial, because their .remove() callbacks returned
> zero unconditionally.
> 
> There are no interdependencies between these patches, so they could be picked
> up individually. But I'd hope that they get picked up all together by the
> extcon maintainer team.
> 
> Best regards
> Uwe
> 
> Uwe Kleine-König (7):
>   extcon: adc-jack: Convert to platform remove callback returning void
>   extcon: intel-cht-wc: Convert to platform remove callback returning void
>   extcon: intel-mrfld: Convert to platform remove callback returning void
>   extcon: max3355: Convert to platform remove callback returning void
>   extcon: max77843: Convert to platform remove callback returning void
>   extcon: usb-gpio: Convert to platform remove callback returning void
>   extcon: usbc-cros-ec: Convert to platform remove callback returning void
> 
>  drivers/extcon/extcon-adc-jack.c     | 6 ++----
>  drivers/extcon/extcon-intel-cht-wc.c | 6 ++----  drivers/extcon/extcon-
> intel-mrfld.c  | 6 ++----
>  drivers/extcon/extcon-max3355.c      | 6 ++----
>  drivers/extcon/extcon-max77843.c     | 6 ++----
>  drivers/extcon/extcon-usb-gpio.c     | 6 ++----
>  drivers/extcon/extcon-usbc-cros-ec.c | 6 ++----
>  7 files changed, 14 insertions(+), 28 deletions(-)
> 

Applied them. Thanks.

Best Regards,
Chanwoo Choi