linux-kernel - Re: [PATCHv4 net-next] net: ag71xx: get reset control using devm api

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Message-ID: <20240827161258.535f8835@kernel.org>
Date: Tue, 27 Aug 2024 16:12:58 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Rosen Penev <rosenp@...il.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
 pabeni@...hat.com, linux@...linux.org.uk, linux-kernel@...r.kernel.org,
 o.rempel@...gutronix.de, p.zabel@...gutronix.de
Subject: Re: [PATCHv4 net-next] net: ag71xx: get reset control using devm
 api

On Mon, 26 Aug 2024 14:21:57 -0700 Rosen Penev wrote:
> Currently, the of variant is missing reset_control_put in error paths.
> The devm variant does not require it.
> 
> Allows removing mdio_reset from the struct as it is not used outside the
> function.

> @@ -683,6 +682,7 @@ static int ag71xx_mdio_probe(struct ag71xx *ag)
>  	struct device *dev = &ag->pdev->dev;
>  	struct net_device *ndev = ag->ndev;
>  	static struct mii_bus *mii_bus;
> +	struct reset_control *mdio_reset;

nit: maintain the longest to shortest ordering of the variables
(sorted by line length not type length)

>  	struct device_node *np, *mnp;
>  	int err;
>  
> @@ -698,10 +698,10 @@ static int ag71xx_mdio_probe(struct ag71xx *ag)
>  	if (!mii_bus)
>  		return -ENOMEM;
>  
> -	ag->mdio_reset = of_reset_control_get_exclusive(np, "mdio");
> -	if (IS_ERR(ag->mdio_reset)) {
> +	mdio_reset = devm_reset_control_get_exclusive(dev, "mdio");
> +	if (IS_ERR(mdio_reset)) {
>  		netif_err(ag, probe, ndev, "Failed to get reset mdio.\n");
> -		return PTR_ERR(ag->mdio_reset);
> +		return PTR_ERR(mdio_reset);
>  	}
>  
>  	mii_bus->name = "ag71xx_mdio";
> @@ -712,10 +712,10 @@ static int ag71xx_mdio_probe(struct ag71xx *ag)
>  	mii_bus->parent = dev;
>  	snprintf(mii_bus->id, MII_BUS_ID_SIZE, "%s.%d", np->name, ag->mac_idx);
>  
> -	if (!IS_ERR(ag->mdio_reset)) {
> -		reset_control_assert(ag->mdio_reset);
> +	if (!IS_ERR(mdio_reset)) {

Are you planning to follow up to remove this check?
Would be nice to do that as second patch in the same series

> +		reset_control_assert(mdio_reset);
>  		msleep(100);
> -		reset_control_deassert(ag->mdio_reset);
> +		reset_control_deassert(mdio_reset);
>  		msleep(200);
>  	}
>