linux-kernel - [PATCH 2/2] counter: ti-eqep: Convert to platform remove callback returning void

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Sun, 10 Mar 2024 09:06:07 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: William Breathitt Gray <william.gray@...aro.org>
Cc: David Lechner <david@...hnology.com>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH 2/2] counter: ti-eqep: Convert to platform remove callback returning void

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@...gutronix.de>
---
 drivers/counter/ti-eqep.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c
index b0f24cf3e891..072b11fd6b32 100644
--- a/drivers/counter/ti-eqep.c
+++ b/drivers/counter/ti-eqep.c
@@ -425,7 +425,7 @@ static int ti_eqep_probe(struct platform_device *pdev)
 	return 0;
 }

-static int ti_eqep_remove(struct platform_device *pdev)
+static void ti_eqep_remove(struct platform_device *pdev)
 {
 	struct counter_device *counter = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
@@ -433,8 +433,6 @@ static int ti_eqep_remove(struct platform_device *pdev)
 	counter_unregister(counter);
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
-
-	return 0;
 }

 static const struct of_device_id ti_eqep_of_match[] = {
@@ -445,7 +443,7 @@ MODULE_DEVICE_TABLE(of, ti_eqep_of_match);

 static struct platform_driver ti_eqep_driver = {
 	.probe = ti_eqep_probe,
-	.remove = ti_eqep_remove,
+	.remove_new = ti_eqep_remove,
 	.driver = {
 		.name = "ti-eqep-cnt",
 		.of_match_table = ti_eqep_of_match,
-- 
2.43.0