linux-kernel - [PATCH 09/18] perf: arm_smmuv3: Convert to platform remove callback returning void

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Message-ID:  <23bfd1a73ce819ffce6137c237608684a3cdfda6.1702648125.git.u.kleine-koenig@pengutronix.de>
Date: Fri, 15 Dec 2023 14:59:09 +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 09/18] perf: arm_smmuv3: 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_smmuv3_pmu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c
index 6303b82566f9..af3ab3eb944e 100644
--- a/drivers/perf/arm_smmuv3_pmu.c
+++ b/drivers/perf/arm_smmuv3_pmu.c
@@ -965,14 +965,12 @@ static int smmu_pmu_probe(struct platform_device *pdev)
 	return err;
 }

-static int smmu_pmu_remove(struct platform_device *pdev)
+static void smmu_pmu_remove(struct platform_device *pdev)
 {
 	struct smmu_pmu *smmu_pmu = platform_get_drvdata(pdev);

 	perf_pmu_unregister(&smmu_pmu->pmu);
 	cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node);
-
-	return 0;
 }

 static void smmu_pmu_shutdown(struct platform_device *pdev)
@@ -997,7 +995,7 @@ static struct platform_driver smmu_pmu_driver = {
 		.suppress_bind_attrs = true,
 	},
 	.probe = smmu_pmu_probe,
-	.remove = smmu_pmu_remove,
+	.remove_new = smmu_pmu_remove,
 	.shutdown = smmu_pmu_shutdown,
 };

-- 
2.42.0