perf: arm_dsu: 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@pengutronix.de>
Link: https://lore.kernel.org/r/1eda5e216afcb0e26a50e9be112d4514ffd0844a.1702648125.git.u.kleine-koenig@pengutronix.de
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
index 7ec4498e312f738e72cf276937783ab51f4e716a..bae3ca37f846ee9d7fb9c982ae3eb7d740e11ba7 100644 (file)
--- a/drivers/perf/arm_dsu_pmu.c
+++ b/drivers/perf/arm_dsu_pmu.c
@@ -774,14 +774,12 @@ static int dsu_pmu_device_probe(struct platform_device *pdev)
        return rc;
 }
 
-static int dsu_pmu_device_remove(struct platform_device *pdev)
+static void dsu_pmu_device_remove(struct platform_device *pdev)
 {
        struct dsu_pmu *dsu_pmu = platform_get_drvdata(pdev);
 
        perf_pmu_unregister(&dsu_pmu->pmu);
        cpuhp_state_remove_instance(dsu_pmu_cpuhp_state, &dsu_pmu->cpuhp_node);
-
-       return 0;
 }
 
 static const struct of_device_id dsu_pmu_of_match[] = {
@@ -806,7 +804,7 @@ static struct platform_driver dsu_pmu_driver = {
                .suppress_bind_attrs = true,
        },
        .probe = dsu_pmu_device_probe,
-       .remove = dsu_pmu_device_remove,
+       .remove_new = dsu_pmu_device_remove,
 };
 
 static int dsu_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)