linux-kernel - [PATCH 05/18] perf: arm-cmn: Convert to platform remove callback returning void

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Message-ID:  <8698ca612e17292f8a8bbb2d1c0f6be4b2053da7.1702648125.git.u.kleine-koenig@pengutronix.de>
Date: Fri, 15 Dec 2023 14:59:05 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/18] perf: arm-cmn: 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/perf/arm-cmn.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index c584165b13ba..ac7a953fe902 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -2504,7 +2504,7 @@ static int arm_cmn_probe(struct platform_device *pdev)
 	return err;
 }

-static int arm_cmn_remove(struct platform_device *pdev)
+static void arm_cmn_remove(struct platform_device *pdev)
 {
 	struct arm_cmn *cmn = platform_get_drvdata(pdev);

@@ -2513,7 +2513,6 @@ static int arm_cmn_remove(struct platform_device *pdev)
 	perf_pmu_unregister(&cmn->pmu);
 	cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
 	debugfs_remove(cmn->debug);
-	return 0;
 }

 #ifdef CONFIG_OF
@@ -2544,7 +2543,7 @@ static struct platform_driver arm_cmn_driver = {
 		.acpi_match_table = ACPI_PTR(arm_cmn_acpi_match),
 	},
 	.probe = arm_cmn_probe,
-	.remove = arm_cmn_remove,
+	.remove_new = arm_cmn_remove,
 };

 static int __init arm_cmn_init(void)
-- 
2.42.0