linux-kernel - [PATCH 10/18] perf: arm_spe: Convert to platform remove callback returning void

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Message-ID:  <abfedc224eca7f4960b7ddfb6daedd47a3699ca5.1702648125.git.u.kleine-koenig@pengutronix.de>
Date: Fri, 15 Dec 2023 14:59:10 +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 10/18] perf: arm_spe: 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_spe_pmu.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/perf/arm_spe_pmu.c b/drivers/perf/arm_spe_pmu.c
index b622d75d8c9e..35f0de03416f 100644
--- a/drivers/perf/arm_spe_pmu.c
+++ b/drivers/perf/arm_spe_pmu.c
@@ -1263,14 +1263,13 @@ static int arm_spe_pmu_device_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int arm_spe_pmu_device_remove(struct platform_device *pdev)
+static void arm_spe_pmu_device_remove(struct platform_device *pdev)
 {
 	struct arm_spe_pmu *spe_pmu = platform_get_drvdata(pdev);
 
 	arm_spe_pmu_perf_destroy(spe_pmu);
 	arm_spe_pmu_dev_teardown(spe_pmu);
 	free_percpu(spe_pmu->handle);
-	return 0;
 }
 
 static struct platform_driver arm_spe_pmu_driver = {
@@ -1281,7 +1280,7 @@ static struct platform_driver arm_spe_pmu_driver = {
 		.suppress_bind_attrs = true,
 	},
 	.probe	= arm_spe_pmu_device_probe,
-	.remove	= arm_spe_pmu_device_remove,
+	.remove_new = arm_spe_pmu_device_remove,
 };
 
 static int __init arm_spe_pmu_init(void)
-- 
2.42.0