[PATCH 00/18] mfd: Convert to platform remove callback returning void

[PATCH 00/18] mfd: Convert to platform remove callback returning void

[Uwe Kleine-König]

Hello,

this series converts all platform drivers below drivers/mfd to use
.remove_new(). Compared to the traditional .remove() callback
.remove_new() returns no value. This is a good thing because the driver
core doesn't (and cannot) cope for errors during remove. The only effect
of a non-zero return value in .remove() is that the driver core emits a
warning. The device is removed anyhow and an early return from .remove()
usually yields resource leaks and/or use-after-free bugs.

See commit 5c5a7680e67b ("platform: Provide a remove callback that
returns no value") for an extended explanation and the eventual goal.

All drivers converted here already returned zero unconditionally in
.remove(), so they are converted here trivially.

Best regards
Uwe

Uwe Kleine-König (18):
  mfd: ab8500-sysctrl: Convert to platform remove callback returning
    void
  mfd: cros_ec_dev: Convert to platform remove callback returning void
  mfd: exynos-lpass: Convert to platform remove callback returning void
  mfd: fsl-imx25-tsadc: Convert to platform remove callback returning
    void
  mfd: hi655x-pmic: Convert to platform remove callback returning void
  mfd: intel-lpss-acpi: Convert to platform remove callback returning
    void
  mfd: kempld-core: Convert to platform remove callback returning void
  mfd: mcp-sa11x0: Convert to platform remove callback returning void
  mfd: mxs-lradc: Convert to platform remove callback returning void
  mfd: omap-usb-host: Convert to platform remove callback returning void
  mfd: omap-usb-tll: Convert to platform remove callback returning void
  mfd: pcf50633-adc: Convert to platform remove callback returning void
  mfd: qcom-pm8xxx: Convert to platform remove callback returning void
  mfd: sm501: Convert to platform remove callback returning void
  mfd: stm32-timers: Convert to platform remove callback returning void
  mfd: ti_am335x_tscadc: Convert to platform remove callback returning
    void
  mfd: tps65911-comparator: Convert to platform remove callback
    returning void
  mfd: twl4030-audio: Convert to platform remove callback returning void

 drivers/mfd/ab8500-sysctrl.c      | 6 ++----
 drivers/mfd/cros_ec_dev.c         | 5 ++---
 drivers/mfd/exynos-lpass.c        | 6 ++----
 drivers/mfd/fsl-imx25-tsadc.c     | 6 ++----
 drivers/mfd/hi655x-pmic.c         | 5 ++---
 drivers/mfd/intel-lpss-acpi.c     | 6 ++----
 drivers/mfd/kempld-core.c         | 6 ++----
 drivers/mfd/mcp-sa11x0.c          | 6 ++----
 drivers/mfd/mxs-lradc.c           | 6 ++----
 drivers/mfd/omap-usb-host.c       | 5 ++---
 drivers/mfd/omap-usb-tll.c        | 5 ++---
 drivers/mfd/pcf50633-adc.c        | 6 ++----
 drivers/mfd/qcom-pm8xxx.c         | 6 ++----
 drivers/mfd/sm501.c               | 6 ++----
 drivers/mfd/stm32-timers.c        | 6 ++----
 drivers/mfd/ti_am335x_tscadc.c    | 6 ++----
 drivers/mfd/tps65911-comparator.c | 6 ++----
 drivers/mfd/twl4030-audio.c       | 6 ++----
 18 files changed, 36 insertions(+), 68 deletions(-)

base-commit: 3ff7a5781ceee3befb9224d29cef6e6a4766c5fe
-- 
2.42.0

[PATCH 00/18] mfd: Convert to platform remove callback returning void

[Uwe Kleine-König]

Hello,

this series converts all platform drivers below drivers/mfd to use
.remove_new(). Compared to the traditional .remove() callback
.remove_new() returns no value. This is a good thing because the driver
core doesn't (and cannot) cope for errors during remove. The only effect
of a non-zero return value in .remove() is that the driver core emits a
warning. The device is removed anyhow and an early return from .remove()
usually yields resource leaks and/or use-after-free bugs.

See commit 5c5a7680e67b ("platform: Provide a remove callback that
returns no value") for an extended explanation and the eventual goal.

All drivers converted here already returned zero unconditionally in
.remove(), so they are converted here trivially.

Best regards
Uwe

Uwe Kleine-König (18):
  mfd: ab8500-sysctrl: Convert to platform remove callback returning
    void
  mfd: cros_ec_dev: Convert to platform remove callback returning void
  mfd: exynos-lpass: Convert to platform remove callback returning void
  mfd: fsl-imx25-tsadc: Convert to platform remove callback returning
    void
  mfd: hi655x-pmic: Convert to platform remove callback returning void
  mfd: intel-lpss-acpi: Convert to platform remove callback returning
    void
  mfd: kempld-core: Convert to platform remove callback returning void
  mfd: mcp-sa11x0: Convert to platform remove callback returning void
  mfd: mxs-lradc: Convert to platform remove callback returning void
  mfd: omap-usb-host: Convert to platform remove callback returning void
  mfd: omap-usb-tll: Convert to platform remove callback returning void
  mfd: pcf50633-adc: Convert to platform remove callback returning void
  mfd: qcom-pm8xxx: Convert to platform remove callback returning void
  mfd: sm501: Convert to platform remove callback returning void
  mfd: stm32-timers: Convert to platform remove callback returning void
  mfd: ti_am335x_tscadc: Convert to platform remove callback returning
    void
  mfd: tps65911-comparator: Convert to platform remove callback
    returning void
  mfd: twl4030-audio: Convert to platform remove callback returning void

 drivers/mfd/ab8500-sysctrl.c      | 6 ++----
 drivers/mfd/cros_ec_dev.c         | 5 ++---
 drivers/mfd/exynos-lpass.c        | 6 ++----
 drivers/mfd/fsl-imx25-tsadc.c     | 6 ++----
 drivers/mfd/hi655x-pmic.c         | 5 ++---
 drivers/mfd/intel-lpss-acpi.c     | 6 ++----
 drivers/mfd/kempld-core.c         | 6 ++----
 drivers/mfd/mcp-sa11x0.c          | 6 ++----
 drivers/mfd/mxs-lradc.c           | 6 ++----
 drivers/mfd/omap-usb-host.c       | 5 ++---
 drivers/mfd/omap-usb-tll.c        | 5 ++---
 drivers/mfd/pcf50633-adc.c        | 6 ++----
 drivers/mfd/qcom-pm8xxx.c         | 6 ++----
 drivers/mfd/sm501.c               | 6 ++----
 drivers/mfd/stm32-timers.c        | 6 ++----
 drivers/mfd/ti_am335x_tscadc.c    | 6 ++----
 drivers/mfd/tps65911-comparator.c | 6 ++----
 drivers/mfd/twl4030-audio.c       | 6 ++----
 18 files changed, 36 insertions(+), 68 deletions(-)

base-commit: 3ff7a5781ceee3befb9224d29cef6e6a4766c5fe
-- 
2.42.0


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[PATCH 01/18] mfd: ab8500-sysctrl: 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/mfd/ab8500-sysctrl.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
index eeeb62415f53..ce81fcb785d0 100644
--- a/drivers/mfd/ab8500-sysctrl.c
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -140,14 +140,12 @@ static int ab8500_sysctrl_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int ab8500_sysctrl_remove(struct platform_device *pdev)
+static void ab8500_sysctrl_remove(struct platform_device *pdev)
 {
 	sysctrl_dev = NULL;
 
 	if (pm_power_off == ab8500_power_off)
 		pm_power_off = NULL;
-
-	return 0;
 }
 
 static const struct of_device_id ab8500_sysctrl_match[] = {
@@ -161,7 +159,7 @@ static struct platform_driver ab8500_sysctrl_driver = {
 		.of_match_table = ab8500_sysctrl_match,
 	},
 	.probe = ab8500_sysctrl_probe,
-	.remove = ab8500_sysctrl_remove,
+	.remove_new = ab8500_sysctrl_remove,
 };
 
 static int __init ab8500_sysctrl_init(void)
-- 
2.42.0


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Re: [PATCH 01/18] mfd: ab8500-sysctrl: Convert to platform remove callback returning void

[Linus Walleij]

On Mon, Nov 6, 2023 at 6:17 PM Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> 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>

Acked-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

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[PATCH 02/18] mfd: cros_ec_dev: 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/mfd/cros_ec_dev.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 79d393b602bf..603b1cd52785 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -288,13 +288,12 @@ static int ec_device_probe(struct platform_device *pdev)
 	return retval;
 }
 
-static int ec_device_remove(struct platform_device *pdev)
+static void ec_device_remove(struct platform_device *pdev)
 {
 	struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
 
 	mfd_remove_devices(ec->dev);
 	device_unregister(&ec->class_dev);
-	return 0;
 }
 
 static const struct platform_device_id cros_ec_id[] = {
@@ -309,7 +308,7 @@ static struct platform_driver cros_ec_dev_driver = {
 	},
 	.id_table = cros_ec_id,
 	.probe = ec_device_probe,
-	.remove = ec_device_remove,
+	.remove_new = ec_device_remove,
 };
 
 static int __init cros_ec_dev_init(void)
-- 
2.42.0

[PATCH 03/18] mfd: exynos-lpass: 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/mfd/exynos-lpass.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c
index 1506d8d352b1..e58990c85ed8 100644
--- a/drivers/mfd/exynos-lpass.c
+++ b/drivers/mfd/exynos-lpass.c
@@ -137,7 +137,7 @@ static int exynos_lpass_probe(struct platform_device *pdev)
 	return devm_of_platform_populate(dev);
 }
 
-static int exynos_lpass_remove(struct platform_device *pdev)
+static void exynos_lpass_remove(struct platform_device *pdev)
 {
 	struct exynos_lpass *lpass = platform_get_drvdata(pdev);
 
@@ -146,8 +146,6 @@ static int exynos_lpass_remove(struct platform_device *pdev)
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		exynos_lpass_disable(lpass);
 	regmap_exit(lpass->top);
-
-	return 0;
 }
 
 static int __maybe_unused exynos_lpass_suspend(struct device *dev)
@@ -187,7 +185,7 @@ static struct platform_driver exynos_lpass_driver = {
 		.of_match_table	= exynos_lpass_of_match,
 	},
 	.probe	= exynos_lpass_probe,
-	.remove	= exynos_lpass_remove,
+	.remove_new = exynos_lpass_remove,
 };
 module_platform_driver(exynos_lpass_driver);
 
-- 
2.42.0

[PATCH 03/18] mfd: exynos-lpass: 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/mfd/exynos-lpass.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c
index 1506d8d352b1..e58990c85ed8 100644
--- a/drivers/mfd/exynos-lpass.c
+++ b/drivers/mfd/exynos-lpass.c
@@ -137,7 +137,7 @@ static int exynos_lpass_probe(struct platform_device *pdev)
 	return devm_of_platform_populate(dev);
 }
 
-static int exynos_lpass_remove(struct platform_device *pdev)
+static void exynos_lpass_remove(struct platform_device *pdev)
 {
 	struct exynos_lpass *lpass = platform_get_drvdata(pdev);
 
@@ -146,8 +146,6 @@ static int exynos_lpass_remove(struct platform_device *pdev)
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		exynos_lpass_disable(lpass);
 	regmap_exit(lpass->top);
-
-	return 0;
 }
 
 static int __maybe_unused exynos_lpass_suspend(struct device *dev)
@@ -187,7 +185,7 @@ static struct platform_driver exynos_lpass_driver = {
 		.of_match_table	= exynos_lpass_of_match,
 	},
 	.probe	= exynos_lpass_probe,
-	.remove	= exynos_lpass_remove,
+	.remove_new = exynos_lpass_remove,
 };
 module_platform_driver(exynos_lpass_driver);
 
-- 
2.42.0


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[PATCH 04/18] mfd: fsl-imx25-tsadc: 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/mfd/fsl-imx25-tsadc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/fsl-imx25-tsadc.c b/drivers/mfd/fsl-imx25-tsadc.c
index 089c2ce615b6..74f38bf3778f 100644
--- a/drivers/mfd/fsl-imx25-tsadc.c
+++ b/drivers/mfd/fsl-imx25-tsadc.c
@@ -194,11 +194,9 @@ static int mx25_tsadc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mx25_tsadc_remove(struct platform_device *pdev)
+static void mx25_tsadc_remove(struct platform_device *pdev)
 {
 	mx25_tsadc_unset_irq(pdev);
-
-	return 0;
 }
 
 static const struct of_device_id mx25_tsadc_ids[] = {
@@ -213,7 +211,7 @@ static struct platform_driver mx25_tsadc_driver = {
 		.of_match_table = mx25_tsadc_ids,
 	},
 	.probe = mx25_tsadc_probe,
-	.remove = mx25_tsadc_remove,
+	.remove_new = mx25_tsadc_remove,
 };
 module_platform_driver(mx25_tsadc_driver);
 
-- 
2.42.0


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[PATCH 09/18] mfd: mxs-lradc: 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/mfd/mxs-lradc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/mxs-lradc.c b/drivers/mfd/mxs-lradc.c
index ec1b356562b9..73893890b50a 100644
--- a/drivers/mfd/mxs-lradc.c
+++ b/drivers/mfd/mxs-lradc.c
@@ -230,13 +230,11 @@ static int mxs_lradc_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int mxs_lradc_remove(struct platform_device *pdev)
+static void mxs_lradc_remove(struct platform_device *pdev)
 {
 	struct mxs_lradc *lradc = platform_get_drvdata(pdev);
 
 	clk_disable_unprepare(lradc->clk);
-
-	return 0;
 }
 
 static struct platform_driver mxs_lradc_driver = {
@@ -245,7 +243,7 @@ static struct platform_driver mxs_lradc_driver = {
 		.of_match_table = mxs_lradc_dt_ids,
 	},
 	.probe = mxs_lradc_probe,
-	.remove = mxs_lradc_remove,
+	.remove_new = mxs_lradc_remove,
 };
 module_platform_driver(mxs_lradc_driver);
 
-- 
2.42.0


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[PATCH 10/18] mfd: omap-usb-host: 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/mfd/omap-usb-host.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 78f1bb55dbc0..ebc62033db16 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -816,13 +816,12 @@ static int usbhs_omap_remove_child(struct device *dev, void *data)
  *
  * Reverses the effect of usbhs_omap_probe().
  */
-static int usbhs_omap_remove(struct platform_device *pdev)
+static void usbhs_omap_remove(struct platform_device *pdev)
 {
 	pm_runtime_disable(&pdev->dev);
 
 	/* remove children */
 	device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);
-	return 0;
 }
 
 static const struct dev_pm_ops usbhsomap_dev_pm_ops = {
@@ -845,7 +844,7 @@ static struct platform_driver usbhs_omap_driver = {
 		.of_match_table = usbhs_omap_dt_ids,
 	},
 	.probe		= usbhs_omap_probe,
-	.remove		= usbhs_omap_remove,
+	.remove_new	= usbhs_omap_remove,
 };
 
 MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
-- 
2.42.0

[PATCH 11/18] mfd: omap-usb-tll: 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/mfd/omap-usb-tll.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c
index 906353735c78..b6303ddb013b 100644
--- a/drivers/mfd/omap-usb-tll.c
+++ b/drivers/mfd/omap-usb-tll.c
@@ -270,7 +270,7 @@ static int usbtll_omap_probe(struct platform_device *pdev)
  *
  * Reverses the effect of usbtll_omap_probe().
  */
-static int usbtll_omap_remove(struct platform_device *pdev)
+static void usbtll_omap_remove(struct platform_device *pdev)
 {
 	struct usbtll_omap *tll = platform_get_drvdata(pdev);
 	int i;
@@ -287,7 +287,6 @@ static int usbtll_omap_remove(struct platform_device *pdev)
 	}
 
 	pm_runtime_disable(&pdev->dev);
-	return 0;
 }
 
 static const struct of_device_id usbtll_omap_dt_ids[] = {
@@ -303,7 +302,7 @@ static struct platform_driver usbtll_omap_driver = {
 		.of_match_table = usbtll_omap_dt_ids,
 	},
 	.probe		= usbtll_omap_probe,
-	.remove		= usbtll_omap_remove,
+	.remove_new	= usbtll_omap_remove,
 };
 
 int omap_tll_init(struct usbhs_omap_platform_data *pdata)
-- 
2.42.0

[PATCH 13/18] mfd: qcom-pm8xxx: 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/mfd/qcom-pm8xxx.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/qcom-pm8xxx.c b/drivers/mfd/qcom-pm8xxx.c
index 07c531bd1236..8b6285f687da 100644
--- a/drivers/mfd/qcom-pm8xxx.c
+++ b/drivers/mfd/qcom-pm8xxx.c
@@ -585,19 +585,17 @@ static int pm8xxx_remove_child(struct device *dev, void *unused)
 	return 0;
 }
 
-static int pm8xxx_remove(struct platform_device *pdev)
+static void pm8xxx_remove(struct platform_device *pdev)
 {
 	struct pm_irq_chip *chip = platform_get_drvdata(pdev);
 
 	device_for_each_child(&pdev->dev, NULL, pm8xxx_remove_child);
 	irq_domain_remove(chip->irqdomain);
-
-	return 0;
 }
 
 static struct platform_driver pm8xxx_driver = {
 	.probe		= pm8xxx_probe,
-	.remove		= pm8xxx_remove,
+	.remove_new	= pm8xxx_remove,
 	.driver		= {
 		.name	= "pm8xxx-core",
 		.of_match_table = pm8xxx_id_table,
-- 
2.42.0

Re: [PATCH 13/18] mfd: qcom-pm8xxx: Convert to platform remove callback returning void

[Konrad Dybcio]

On 11/6/23 18:17, 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: Konrad Dybcio <konrad.dybcio@linaro.org>

Konrad

[PATCH 15/18] mfd: stm32-timers: 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/mfd/stm32-timers.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/stm32-timers.c b/drivers/mfd/stm32-timers.c
index a656a1c186a8..9fd13d88950c 100644
--- a/drivers/mfd/stm32-timers.c
+++ b/drivers/mfd/stm32-timers.c
@@ -306,7 +306,7 @@ static int stm32_timers_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int stm32_timers_remove(struct platform_device *pdev)
+static void stm32_timers_remove(struct platform_device *pdev)
 {
 	struct stm32_timers *ddata = platform_get_drvdata(pdev);
 
@@ -316,8 +316,6 @@ static int stm32_timers_remove(struct platform_device *pdev)
 	 */
 	of_platform_depopulate(&pdev->dev);
 	stm32_timers_dma_remove(&pdev->dev, ddata);
-
-	return 0;
 }
 
 static const struct of_device_id stm32_timers_of_match[] = {
@@ -328,7 +326,7 @@ MODULE_DEVICE_TABLE(of, stm32_timers_of_match);
 
 static struct platform_driver stm32_timers_driver = {
 	.probe = stm32_timers_probe,
-	.remove = stm32_timers_remove,
+	.remove_new = stm32_timers_remove,
 	.driver	= {
 		.name = "stm32-timers",
 		.of_match_table = stm32_timers_of_match,
-- 
2.42.0


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[PATCH 18/18] mfd: twl4030-audio: 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/mfd/twl4030-audio.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/twl4030-audio.c b/drivers/mfd/twl4030-audio.c
index 88002f8941e5..d436ddf661da 100644
--- a/drivers/mfd/twl4030-audio.c
+++ b/drivers/mfd/twl4030-audio.c
@@ -258,12 +258,10 @@ static int twl4030_audio_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int twl4030_audio_remove(struct platform_device *pdev)
+static void twl4030_audio_remove(struct platform_device *pdev)
 {
 	mfd_remove_devices(&pdev->dev);
 	twl4030_audio_dev = NULL;
-
-	return 0;
 }
 
 static const struct of_device_id twl4030_audio_of_match[] = {
@@ -278,7 +276,7 @@ static struct platform_driver twl4030_audio_driver = {
 		.of_match_table = twl4030_audio_of_match,
 	},
 	.probe		= twl4030_audio_probe,
-	.remove		= twl4030_audio_remove,
+	.remove_new	= twl4030_audio_remove,
 };
 
 module_platform_driver(twl4030_audio_driver);
-- 
2.42.0

Re: [PATCH 00/18] mfd: Convert to platform remove callback returning void

[Lee Jones]

On Mon, 06 Nov 2023 18:17:09 +0100, Uwe Kleine-König wrote:
> this series converts all platform drivers below drivers/mfd to use
> .remove_new(). Compared to the traditional .remove() callback
> .remove_new() returns no value. This is a good thing because the driver
> core doesn't (and cannot) cope for errors during remove. The only effect
> of a non-zero return value in .remove() is that the driver core emits a
> warning. The device is removed anyhow and an early return from .remove()
> usually yields resource leaks and/or use-after-free bugs.
> 
> [...]

Applied, thanks!

[01/18] mfd: ab8500-sysctrl: Convert to platform remove callback returning void
        commit: 35cf346f9fa92ceb19c5d2edc4409a7d384da8ee
[02/18] mfd: cros_ec_dev: Convert to platform remove callback returning void
        commit: 981c92a1d65a7ccce2d814c66ff2deecca304672
[03/18] mfd: exynos-lpass: Convert to platform remove callback returning void
        commit: 2d859aa8e081884c0c02d738925cba23a8cfb1b8
[04/18] mfd: fsl-imx25-tsadc: Convert to platform remove callback returning void
        commit: f215b75acc85254a29404b32c871b7ff2ea8da2a
[09/18] mfd: mxs-lradc: Convert to platform remove callback returning void
        commit: beb1f9e6382f59339e118594c94ee6b5ac96f3ec
[10/18] mfd: omap-usb-host: Convert to platform remove callback returning void
        commit: 231927898ae91049aa35d237c556cc216d80e8f7
[11/18] mfd: omap-usb-tll: Convert to platform remove callback returning void
        commit: 83d4e355240147db7597ea1ce64624fcdaaee6ae
[13/18] mfd: qcom-pm8xxx: Convert to platform remove callback returning void
        commit: ae3bcd5b09e35f363aa1744d38f90fda2b40e9ca
[15/18] mfd: stm32-timers: Convert to platform remove callback returning void
        commit: aeebc47f8d479c363e24fba0201ef8dca417fe6e
[18/18] mfd: twl4030-audio: Convert to platform remove callback returning void
        commit: 3716978b584a8baaba16d64c93eb0fed0edcbc3b

--
Lee Jones [李琼斯]

Re: [PATCH 00/18] mfd: Convert to platform remove callback returning void

[Lee Jones]

On Mon, 06 Nov 2023 18:17:09 +0100, Uwe Kleine-König wrote:
> this series converts all platform drivers below drivers/mfd to use
> .remove_new(). Compared to the traditional .remove() callback
> .remove_new() returns no value. This is a good thing because the driver
> core doesn't (and cannot) cope for errors during remove. The only effect
> of a non-zero return value in .remove() is that the driver core emits a
> warning. The device is removed anyhow and an early return from .remove()
> usually yields resource leaks and/or use-after-free bugs.
> 
> [...]

Applied, thanks!

[01/18] mfd: ab8500-sysctrl: Convert to platform remove callback returning void
        commit: 35cf346f9fa92ceb19c5d2edc4409a7d384da8ee
[02/18] mfd: cros_ec_dev: Convert to platform remove callback returning void
        commit: 981c92a1d65a7ccce2d814c66ff2deecca304672
[03/18] mfd: exynos-lpass: Convert to platform remove callback returning void
        commit: 2d859aa8e081884c0c02d738925cba23a8cfb1b8
[04/18] mfd: fsl-imx25-tsadc: Convert to platform remove callback returning void
        commit: f215b75acc85254a29404b32c871b7ff2ea8da2a
[09/18] mfd: mxs-lradc: Convert to platform remove callback returning void
        commit: beb1f9e6382f59339e118594c94ee6b5ac96f3ec
[10/18] mfd: omap-usb-host: Convert to platform remove callback returning void
        commit: 231927898ae91049aa35d237c556cc216d80e8f7
[11/18] mfd: omap-usb-tll: Convert to platform remove callback returning void
        commit: 83d4e355240147db7597ea1ce64624fcdaaee6ae
[13/18] mfd: qcom-pm8xxx: Convert to platform remove callback returning void
        commit: ae3bcd5b09e35f363aa1744d38f90fda2b40e9ca
[15/18] mfd: stm32-timers: Convert to platform remove callback returning void
        commit: aeebc47f8d479c363e24fba0201ef8dca417fe6e
[18/18] mfd: twl4030-audio: Convert to platform remove callback returning void
        commit: 3716978b584a8baaba16d64c93eb0fed0edcbc3b

--
Lee Jones [李琼斯]


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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH 00/18] mfd: Convert to platform remove callback returning void

[Lee Jones]

On Mon, 06 Nov 2023, Uwe Kleine-König wrote:

> Hello,
> 
> this series converts all platform drivers below drivers/mfd to use
> .remove_new(). Compared to the traditional .remove() callback
> .remove_new() returns no value. This is a good thing because the driver
> core doesn't (and cannot) cope for errors during remove. The only effect
> of a non-zero return value in .remove() is that the driver core emits a
> warning. The device is removed anyhow and an early return from .remove()
> usually yields resource leaks and/or use-after-free bugs.
> 
> See commit 5c5a7680e67b ("platform: Provide a remove callback that
> returns no value") for an extended explanation and the eventual goal.
> 
> All drivers converted here already returned zero unconditionally in
> .remove(), so they are converted here trivially.
> 
> Best regards
> Uwe
> 
> Uwe Kleine-König (18):
>   mfd: ab8500-sysctrl: Convert to platform remove callback returning
>     void
>   mfd: cros_ec_dev: Convert to platform remove callback returning void
>   mfd: exynos-lpass: Convert to platform remove callback returning void
>   mfd: fsl-imx25-tsadc: Convert to platform remove callback returning
>     void
>   mfd: hi655x-pmic: Convert to platform remove callback returning void
>   mfd: intel-lpss-acpi: Convert to platform remove callback returning
>     void
>   mfd: kempld-core: Convert to platform remove callback returning void
>   mfd: mcp-sa11x0: Convert to platform remove callback returning void
>   mfd: mxs-lradc: Convert to platform remove callback returning void
>   mfd: omap-usb-host: Convert to platform remove callback returning void
>   mfd: omap-usb-tll: Convert to platform remove callback returning void
>   mfd: pcf50633-adc: Convert to platform remove callback returning void
>   mfd: qcom-pm8xxx: Convert to platform remove callback returning void
>   mfd: sm501: Convert to platform remove callback returning void
>   mfd: stm32-timers: Convert to platform remove callback returning void
>   mfd: ti_am335x_tscadc: Convert to platform remove callback returning
>     void
>   mfd: tps65911-comparator: Convert to platform remove callback
>     returning void
>   mfd: twl4030-audio: Convert to platform remove callback returning void

Looks like you missed the mailing list on a bunch of these.

I'm going to remove this set for now.

Could you please resubmit it and Cc: LKML?

>  drivers/mfd/ab8500-sysctrl.c      | 6 ++----
>  drivers/mfd/cros_ec_dev.c         | 5 ++---
>  drivers/mfd/exynos-lpass.c        | 6 ++----
>  drivers/mfd/fsl-imx25-tsadc.c     | 6 ++----
>  drivers/mfd/hi655x-pmic.c         | 5 ++---
>  drivers/mfd/intel-lpss-acpi.c     | 6 ++----
>  drivers/mfd/kempld-core.c         | 6 ++----
>  drivers/mfd/mcp-sa11x0.c          | 6 ++----
>  drivers/mfd/mxs-lradc.c           | 6 ++----
>  drivers/mfd/omap-usb-host.c       | 5 ++---
>  drivers/mfd/omap-usb-tll.c        | 5 ++---
>  drivers/mfd/pcf50633-adc.c        | 6 ++----
>  drivers/mfd/qcom-pm8xxx.c         | 6 ++----
>  drivers/mfd/sm501.c               | 6 ++----
>  drivers/mfd/stm32-timers.c        | 6 ++----
>  drivers/mfd/ti_am335x_tscadc.c    | 6 ++----
>  drivers/mfd/tps65911-comparator.c | 6 ++----
>  drivers/mfd/twl4030-audio.c       | 6 ++----
>  18 files changed, 36 insertions(+), 68 deletions(-)
> 
> base-commit: 3ff7a5781ceee3befb9224d29cef6e6a4766c5fe
> -- 
> 2.42.0
> 

-- 
Lee Jones [李琼斯]

Re: [PATCH 00/18] mfd: Convert to platform remove callback returning void

[Lee Jones]

On Mon, 06 Nov 2023, Uwe Kleine-König wrote:

> Hello,
> 
> this series converts all platform drivers below drivers/mfd to use
> .remove_new(). Compared to the traditional .remove() callback
> .remove_new() returns no value. This is a good thing because the driver
> core doesn't (and cannot) cope for errors during remove. The only effect
> of a non-zero return value in .remove() is that the driver core emits a
> warning. The device is removed anyhow and an early return from .remove()
> usually yields resource leaks and/or use-after-free bugs.
> 
> See commit 5c5a7680e67b ("platform: Provide a remove callback that
> returns no value") for an extended explanation and the eventual goal.
> 
> All drivers converted here already returned zero unconditionally in
> .remove(), so they are converted here trivially.
> 
> Best regards
> Uwe
> 
> Uwe Kleine-König (18):
>   mfd: ab8500-sysctrl: Convert to platform remove callback returning
>     void
>   mfd: cros_ec_dev: Convert to platform remove callback returning void
>   mfd: exynos-lpass: Convert to platform remove callback returning void
>   mfd: fsl-imx25-tsadc: Convert to platform remove callback returning
>     void
>   mfd: hi655x-pmic: Convert to platform remove callback returning void
>   mfd: intel-lpss-acpi: Convert to platform remove callback returning
>     void
>   mfd: kempld-core: Convert to platform remove callback returning void
>   mfd: mcp-sa11x0: Convert to platform remove callback returning void
>   mfd: mxs-lradc: Convert to platform remove callback returning void
>   mfd: omap-usb-host: Convert to platform remove callback returning void
>   mfd: omap-usb-tll: Convert to platform remove callback returning void
>   mfd: pcf50633-adc: Convert to platform remove callback returning void
>   mfd: qcom-pm8xxx: Convert to platform remove callback returning void
>   mfd: sm501: Convert to platform remove callback returning void
>   mfd: stm32-timers: Convert to platform remove callback returning void
>   mfd: ti_am335x_tscadc: Convert to platform remove callback returning
>     void
>   mfd: tps65911-comparator: Convert to platform remove callback
>     returning void
>   mfd: twl4030-audio: Convert to platform remove callback returning void

Looks like you missed the mailing list on a bunch of these.

I'm going to remove this set for now.

Could you please resubmit it and Cc: LKML?

>  drivers/mfd/ab8500-sysctrl.c      | 6 ++----
>  drivers/mfd/cros_ec_dev.c         | 5 ++---
>  drivers/mfd/exynos-lpass.c        | 6 ++----
>  drivers/mfd/fsl-imx25-tsadc.c     | 6 ++----
>  drivers/mfd/hi655x-pmic.c         | 5 ++---
>  drivers/mfd/intel-lpss-acpi.c     | 6 ++----
>  drivers/mfd/kempld-core.c         | 6 ++----
>  drivers/mfd/mcp-sa11x0.c          | 6 ++----
>  drivers/mfd/mxs-lradc.c           | 6 ++----
>  drivers/mfd/omap-usb-host.c       | 5 ++---
>  drivers/mfd/omap-usb-tll.c        | 5 ++---
>  drivers/mfd/pcf50633-adc.c        | 6 ++----
>  drivers/mfd/qcom-pm8xxx.c         | 6 ++----
>  drivers/mfd/sm501.c               | 6 ++----
>  drivers/mfd/stm32-timers.c        | 6 ++----
>  drivers/mfd/ti_am335x_tscadc.c    | 6 ++----
>  drivers/mfd/tps65911-comparator.c | 6 ++----
>  drivers/mfd/twl4030-audio.c       | 6 ++----
>  18 files changed, 36 insertions(+), 68 deletions(-)
> 
> base-commit: 3ff7a5781ceee3befb9224d29cef6e6a4766c5fe
> -- 
> 2.42.0
> 

-- 
Lee Jones [李琼斯]

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