linux-kernel - [PATCH 03/18] perf: arm-cci: Convert to platform remove callback returning void

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Message-ID:  <70b581d58cfffdccb9fb3ed17bf3220c00f8033f.1702648124.git.u.kleine-koenig@pengutronix.de>
Date: Fri, 15 Dec 2023 14:59:03 +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 03/18] perf: arm-cci: 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-cci.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 61de861eaf91..6be03f81ae5d 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -1697,16 +1697,14 @@ static int cci_pmu_probe(struct platform_device *pdev)
 	return ret;
 }

-static int cci_pmu_remove(struct platform_device *pdev)
+static void cci_pmu_remove(struct platform_device *pdev)
 {
 	if (!g_cci_pmu)
-		return 0;
+		return;

 	cpuhp_remove_state(CPUHP_AP_PERF_ARM_CCI_ONLINE);
 	perf_pmu_unregister(&g_cci_pmu->pmu);
 	g_cci_pmu = NULL;
-
-	return 0;
 }

 static struct platform_driver cci_pmu_driver = {
@@ -1716,7 +1714,7 @@ static struct platform_driver cci_pmu_driver = {
 		   .suppress_bind_attrs = true,
 		  },
 	.probe = cci_pmu_probe,
-	.remove = cci_pmu_remove,
+	.remove_new = cci_pmu_remove,
 };

 module_platform_driver(cci_pmu_driver);
-- 
2.42.0