netdev - Re: [PATCH net-next 28/54] net: ethernet: litex: Convert to platform remove callback returning void

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Message-ID: <ZQi49RlWeYWPPSxG@errol.ini.cmu.edu>
Date: Mon, 18 Sep 2023 16:54:13 -0400
From: "Gabriel L. Somlo" <gsomlo@...il.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Karol Gugala <kgugala@...micro.com>,
	Mateusz Holenko <mholenko@...micro.com>,
	Joel Stanley <joel@....id.au>, netdev@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [PATCH net-next 28/54] net: ethernet: litex: Convert to platform
 remove callback returning void

On Mon, Sep 18, 2023 at 10:42:00PM +0200, Uwe Kleine-König wrote:
> 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.

Acked-by: Gabriel Somlo <gsomlo@...il.com>

Thanks,
--G
 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> ---
>  drivers/net/ethernet/litex/litex_liteeth.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/litex/litex_liteeth.c b/drivers/net/ethernet/litex/litex_liteeth.c
> index ffa96059079c..5182fe737c37 100644
> --- a/drivers/net/ethernet/litex/litex_liteeth.c
> +++ b/drivers/net/ethernet/litex/litex_liteeth.c
> @@ -294,13 +294,11 @@ static int liteeth_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int liteeth_remove(struct platform_device *pdev)
> +static void liteeth_remove(struct platform_device *pdev)
>  {
>  	struct net_device *netdev = platform_get_drvdata(pdev);
>  
>  	unregister_netdev(netdev);
> -
> -	return 0;
>  }
>  
>  static const struct of_device_id liteeth_of_match[] = {
> @@ -311,7 +309,7 @@ MODULE_DEVICE_TABLE(of, liteeth_of_match);
>  
>  static struct platform_driver liteeth_driver = {
>  	.probe = liteeth_probe,
> -	.remove = liteeth_remove,
> +	.remove_new = liteeth_remove,
>  	.driver = {
>  		.name = DRV_NAME,
>  		.of_match_table = liteeth_of_match,
> -- 
> 2.40.1
>