netdev - [PATCH net-next 08/10] net: wwan: qcom_bam_dmux: Convert to platform remove callback returning void

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Date: Fri, 17 Nov 2023 10:59:31 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Stephan Gerhold <stephan@...hold.net>,
	Andy Gross <agross@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Loic Poulain <loic.poulain@...aro.org>,
	Sergey Ryazanov <ryazanov.s.a@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Johannes Berg <johannes@...solutions.net>,
	netdev@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH net-next 08/10] net: wwan: qcom_bam_dmux: 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/net/wwan/qcom_bam_dmux.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wwan/qcom_bam_dmux.c b/drivers/net/wwan/qcom_bam_dmux.c
index 17d46f4d2913..26ca719fa0de 100644
--- a/drivers/net/wwan/qcom_bam_dmux.c
+++ b/drivers/net/wwan/qcom_bam_dmux.c
@@ -846,7 +846,7 @@ static int bam_dmux_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int bam_dmux_remove(struct platform_device *pdev)
+static void bam_dmux_remove(struct platform_device *pdev)
 {
 	struct bam_dmux *dmux = platform_get_drvdata(pdev);
 	struct device *dev = dmux->dev;
@@ -877,8 +877,6 @@ static int bam_dmux_remove(struct platform_device *pdev)
 	disable_irq(dmux->pc_irq);
 	bam_dmux_power_off(dmux);
 	bam_dmux_free_skbs(dmux->tx_skbs, DMA_TO_DEVICE);
-
-	return 0;
 }
 
 static const struct dev_pm_ops bam_dmux_pm_ops = {
@@ -893,7 +891,7 @@ MODULE_DEVICE_TABLE(of, bam_dmux_of_match);
 
 static struct platform_driver bam_dmux_driver = {
 	.probe = bam_dmux_probe,
-	.remove = bam_dmux_remove,
+	.remove_new = bam_dmux_remove,
 	.driver = {
 		.name = "bam-dmux",
 		.pm = &bam_dmux_pm_ops,
-- 
2.42.0