linux-kernel - [PATCH 16/18] perf: qcom_l2: Convert to platform remove callback returning void

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:  <a2587688c54834482d68fe2a44f415a649ad6477.1702648125.git.u.kleine-koenig@pengutronix.de>
Date: Fri, 15 Dec 2023 14:59:16 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>
Cc: Andy Gross <agross@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 16/18] perf: qcom_l2: 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/qcom_l2_pmu.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/perf/qcom_l2_pmu.c b/drivers/perf/qcom_l2_pmu.c
index 3f9a98c17a89..148df5ae8ef8 100644
--- a/drivers/perf/qcom_l2_pmu.c
+++ b/drivers/perf/qcom_l2_pmu.c
@@ -965,7 +965,7 @@ static int l2_cache_pmu_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int l2_cache_pmu_remove(struct platform_device *pdev)
+static void l2_cache_pmu_remove(struct platform_device *pdev)
 {
 	struct l2cache_pmu *l2cache_pmu =
 		to_l2cache_pmu(platform_get_drvdata(pdev));
@@ -973,7 +973,6 @@ static int l2_cache_pmu_remove(struct platform_device *pdev)
 	perf_pmu_unregister(&l2cache_pmu->pmu);
 	cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
 				    &l2cache_pmu->node);
-	return 0;
 }
 
 static struct platform_driver l2_cache_pmu_driver = {
@@ -983,7 +982,7 @@ static struct platform_driver l2_cache_pmu_driver = {
 		.suppress_bind_attrs = true,
 	},
 	.probe = l2_cache_pmu_probe,
-	.remove = l2_cache_pmu_remove,
+	.remove_new = l2_cache_pmu_remove,
 };
 
 static int __init register_l2_cache_pmu_driver(void)
-- 
2.42.0