diff mbox series

slimbus: Convert to platform remove callback returning void

Message ID 20240225001911.46196-2-u.kleine-koenig@pengutronix.de (mailing list archive)
State Not Applicable
Headers show
Series slimbus: Convert to platform remove callback returning void | expand

Commit Message

Uwe Kleine-König Feb. 25, 2024, 12:19 a.m. UTC 
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 the slimbus drivers 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/slimbus/qcom-ctrl.c     |  5 ++---
 drivers/slimbus/qcom-ngd-ctrl.c | 11 ++++-------
 2 files changed, 6 insertions(+), 10 deletions(-)


base-commit: 33e1d31873f87d119e5120b88cd350efa68ef276

Comments

Uwe Kleine-König April 9, 2024, 4:22 p.m. UTC | #1 
Hello,

On Sun, Feb 25, 2024 at 01:19:12AM +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 the slimbus drivers from always returning zero in the
> remove callback to the void returning variant.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

gentle ping. Who feels responsible to apply (or give feedback to) this
patch?

Best regards
Uwe
Srinivas Kandagatla April 11, 2024, 9:49 a.m. UTC | #2 
On Sun, 25 Feb 2024 01:19:12 +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().
> 
> [...]

Applied, thanks!

[1/1] slimbus: Convert to platform remove callback returning void
      commit: f6c637ffe528068f5470551a1424f173a139d0c7

Best regards,
diff mbox series

Patch

diff --git a/drivers/slimbus/qcom-ctrl.c b/drivers/slimbus/qcom-ctrl.c
index 400b7b385a44..7d632fad1300 100644
--- a/drivers/slimbus/qcom-ctrl.c
+++ b/drivers/slimbus/qcom-ctrl.c
@@ -626,7 +626,7 @@  static int qcom_slim_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int qcom_slim_remove(struct platform_device *pdev)
+static void qcom_slim_remove(struct platform_device *pdev)
 {
 	struct qcom_slim_ctrl *ctrl = platform_get_drvdata(pdev);
 
@@ -635,7 +635,6 @@  static int qcom_slim_remove(struct platform_device *pdev)
 	clk_disable_unprepare(ctrl->rclk);
 	clk_disable_unprepare(ctrl->hclk);
 	destroy_workqueue(ctrl->rxwq);
-	return 0;
 }
 
 /*
@@ -721,7 +720,7 @@  static const struct of_device_id qcom_slim_dt_match[] = {
 
 static struct platform_driver qcom_slim_driver = {
 	.probe = qcom_slim_probe,
-	.remove = qcom_slim_remove,
+	.remove_new = qcom_slim_remove,
 	.driver	= {
 		.name = "qcom_slim_ctrl",
 		.of_match_table = qcom_slim_dt_match,
diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
index efeba8275a66..a5aa364f562e 100644
--- a/drivers/slimbus/qcom-ngd-ctrl.c
+++ b/drivers/slimbus/qcom-ngd-ctrl.c
@@ -1675,14 +1675,12 @@  static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int qcom_slim_ngd_ctrl_remove(struct platform_device *pdev)
+static void qcom_slim_ngd_ctrl_remove(struct platform_device *pdev)
 {
 	platform_driver_unregister(&qcom_slim_ngd_driver);
-
-	return 0;
 }
 
-static int qcom_slim_ngd_remove(struct platform_device *pdev)
+static void qcom_slim_ngd_remove(struct platform_device *pdev)
 {
 	struct qcom_slim_ngd_ctrl *ctrl = platform_get_drvdata(pdev);
 
@@ -1697,7 +1695,6 @@  static int qcom_slim_ngd_remove(struct platform_device *pdev)
 
 	kfree(ctrl->ngd);
 	ctrl->ngd = NULL;
-	return 0;
 }
 
 static int __maybe_unused qcom_slim_ngd_runtime_idle(struct device *dev)
@@ -1740,7 +1737,7 @@  static const struct dev_pm_ops qcom_slim_ngd_dev_pm_ops = {
 
 static struct platform_driver qcom_slim_ngd_ctrl_driver = {
 	.probe = qcom_slim_ngd_ctrl_probe,
-	.remove = qcom_slim_ngd_ctrl_remove,
+	.remove_new = qcom_slim_ngd_ctrl_remove,
 	.driver	= {
 		.name = "qcom,slim-ngd-ctrl",
 		.of_match_table = qcom_slim_ngd_dt_match,
@@ -1749,7 +1746,7 @@  static struct platform_driver qcom_slim_ngd_ctrl_driver = {
 
 static struct platform_driver qcom_slim_ngd_driver = {
 	.probe = qcom_slim_ngd_probe,
-	.remove = qcom_slim_ngd_remove,
+	.remove_new = qcom_slim_ngd_remove,
 	.driver	= {
 		.name = QCOM_SLIM_NGD_DRV_NAME,
 		.pm = &qcom_slim_ngd_dev_pm_ops,