netdev - Re: [PATCH net-next v4 3/3] net: lan743x: Return PTR_ERR() for fixed_phy

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Date: Tue, 22 Aug 2023 17:03:35 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jinjie Ruan <ruanjinjie@...wei.com>
Cc: <rafal@...ecki.pl>, <bcm-kernel-feedback-list@...adcom.com>,
 <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <opendmb@...il.com>, <florian.fainelli@...adcom.com>,
 <bryan.whitehead@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
 <netdev@...r.kernel.org>, <andrew@...n.ch>
Subject: Re: [PATCH net-next v4 3/3] net: lan743x: Return PTR_ERR() for
 fixed_phy_register()

On Mon, 21 Aug 2023 10:50:20 +0800 Jinjie Ruan wrote:
> fixed_phy_register() returns -EPROBE_DEFER, -EINVAL and -EBUSY,
> etc, in addition to -EIO. The Best practice is to return these
> error codes with PTR_ERR().

EPROBE_DEFER is not a unix error code. We can't return it to user
space, so propagating it from ndo_open is not correct.

> diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
> index a36f6369f132..c81cdeb4d4e7 100644
> --- a/drivers/net/ethernet/microchip/lan743x_main.c
> +++ b/drivers/net/ethernet/microchip/lan743x_main.c
> @@ -1515,7 +1515,7 @@ static int lan743x_phy_open(struct lan743x_adapter *adapter)
>  							    &fphy_status, NULL);
>  				if (IS_ERR(phydev)) {
>  					netdev_err(netdev, "No PHY/fixed_PHY found\n");
> -					return -EIO;
> +					return PTR_ERR(phydev);
>  				}
>  			} else {
>  				goto return_error;