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

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Message-ID:  <75dda01b2ad6e17f726830094bd38cb8faab5cbe.1702648125.git.u.kleine-koenig@pengutronix.de>
Date: Fri, 15 Dec 2023 14:59:18 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>
Cc: Khuong Dinh <khuong@...amperecomputing.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 18/18] perf: xgene: 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/xgene_pmu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index 7ce344248dda..0d49343d704b 100644
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -1937,7 +1937,7 @@ xgene_pmu_dev_cleanup(struct xgene_pmu *xgene_pmu, struct list_head *pmus)
 	}
 }
 
-static int xgene_pmu_remove(struct platform_device *pdev)
+static void xgene_pmu_remove(struct platform_device *pdev)
 {
 	struct xgene_pmu *xgene_pmu = dev_get_drvdata(&pdev->dev);
 
@@ -1947,13 +1947,11 @@ static int xgene_pmu_remove(struct platform_device *pdev)
 	xgene_pmu_dev_cleanup(xgene_pmu, &xgene_pmu->mcpmus);
 	cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
 				    &xgene_pmu->node);
-
-	return 0;
 }
 
 static struct platform_driver xgene_pmu_driver = {
 	.probe = xgene_pmu_probe,
-	.remove = xgene_pmu_remove,
+	.remove_new = xgene_pmu_remove,
 	.driver = {
 		.name		= "xgene-pmu",
 		.of_match_table = xgene_pmu_of_match,
-- 
2.42.0