netdev - Re: [PATCH net-next 04/54] net: ethernet: allwinner: Convert to platform remove callback returning void

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Date: Tue, 19 Sep 2023 19:22:31 +0200
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>,
 netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev, kernel@...gutronix.de
Subject:
 Re: [PATCH net-next 04/54] net: ethernet: allwinner: Convert to platform
 remove callback returning void

Dne ponedeljek, 18. september 2023 ob 22:41:36 CEST je Uwe Kleine-König 
napisal(a):
> 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() is 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>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
>  drivers/net/ethernet/allwinner/sun4i-emac.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c
> b/drivers/net/ethernet/allwinner/sun4i-emac.c index
> a94c62956eed..d761c08fe5c1 100644
> --- a/drivers/net/ethernet/allwinner/sun4i-emac.c
> +++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
> @@ -1083,7 +1083,7 @@ static int emac_probe(struct platform_device *pdev)
>  	return ret;
>  }
> 
> -static int emac_remove(struct platform_device *pdev)
> +static void emac_remove(struct platform_device *pdev)
>  {
>  	struct net_device *ndev = platform_get_drvdata(pdev);
>  	struct emac_board_info *db = netdev_priv(ndev);
> @@ -1101,7 +1101,6 @@ static int emac_remove(struct platform_device *pdev)
>  	free_netdev(ndev);
> 
>  	dev_dbg(&pdev->dev, "released and freed device\n");
> -	return 0;
>  }
> 
>  static int emac_suspend(struct platform_device *dev, pm_message_t state)
> @@ -1143,7 +1142,7 @@ static struct platform_driver emac_driver = {
>  		.of_match_table = emac_of_match,
>  	},
>  	.probe = emac_probe,
> -	.remove = emac_remove,
> +	.remove_new = emac_remove,
>  	.suspend = emac_suspend,
>  	.resume = emac_resume,
>  };