linux-kernel - [PATCH 2/7] macintosh: windfarm_pm112: Convert to platform remove callback returning void

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Message-ID:  <eac991c7f2267237382f77bc15c016ff62e1fbb7.1704900449.git.u.kleine-koenig@pengutronix.de>
Date: Wed, 10 Jan 2024 16:42:49 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] macintosh: windfarm_pm112: 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/macintosh/windfarm_pm112.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/macintosh/windfarm_pm112.c b/drivers/macintosh/windfarm_pm112.c
index d1dec314ae30..876b4d8cbe37 100644
--- a/drivers/macintosh/windfarm_pm112.c
+++ b/drivers/macintosh/windfarm_pm112.c
@@ -662,16 +662,14 @@ static int wf_pm112_probe(struct platform_device *dev)
 	return 0;
 }

-static int wf_pm112_remove(struct platform_device *dev)
+static void wf_pm112_remove(struct platform_device *dev)
 {
 	wf_unregister_client(&pm112_events);
-	/* should release all sensors and controls */
-	return 0;
 }

 static struct platform_driver wf_pm112_driver = {
 	.probe = wf_pm112_probe,
-	.remove = wf_pm112_remove,
+	.remove_new = wf_pm112_remove,
 	.driver = {
 		.name = "windfarm",
 	},
-- 
2.43.0