linux-kernel - [PATCH 2/2] bus: fsl-mc: Convert to platform remove callback returning void

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Message-ID: <20231103230001.3652259-4-u.kleine-koenig@pengutronix.de>
Date:   Sat,  4 Nov 2023 00:00:03 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: [PATCH 2/2] bus: fsl-mc: 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. As fsl_mc_bus_remove() has the
same type now as fsl_mc_bus_shutdown() and the only thing the latter
does is to call the former, use fsl_mc_bus_remove() directly as
.shutdown() callback.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index 75a8d365ffd4..78b96cd63de9 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -1167,7 +1167,7 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
  * fsl_mc_bus_remove - callback invoked when the root MC bus is being
  * removed
  */
-static int fsl_mc_bus_remove(struct platform_device *pdev)
+static void fsl_mc_bus_remove(struct platform_device *pdev)
 {
 	struct fsl_mc *mc = platform_get_drvdata(pdev);
 	struct fsl_mc_io *mc_io;
@@ -1187,13 +1187,6 @@ static int fsl_mc_bus_remove(struct platform_device *pdev)
 		       (GCR1_P1_STOP | GCR1_P2_STOP),
 		       mc->fsl_mc_regs + FSL_MC_GCR1);
 	}
-
-	return 0;
-}
-
-static void fsl_mc_bus_shutdown(struct platform_device *pdev)
-{
-	fsl_mc_bus_remove(pdev);
 }

 static const struct of_device_id fsl_mc_bus_match_table[] = {
@@ -1217,8 +1210,8 @@ static struct platform_driver fsl_mc_bus_driver = {
 		   .acpi_match_table = fsl_mc_bus_acpi_match_table,
 		   },
 	.probe = fsl_mc_bus_probe,
-	.remove = fsl_mc_bus_remove,
-	.shutdown = fsl_mc_bus_shutdown,
+	.remove_new = fsl_mc_bus_remove,
+	.shutdown = fsl_mc_bus_remove,
 };

 static int fsl_mc_bus_notifier(struct notifier_block *nb,
-- 
2.42.0