netdev - RE: [PATCH net-next v9 8/9] net: txgbe: Implement phylink pcs

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Date: Fri, 26 May 2023 14:21:23 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: "'Jakub Kicinski'" <kuba@...nel.org>
Cc: <netdev@...r.kernel.org>,
	<jarkko.nikula@...ux.intel.com>,
	<andriy.shevchenko@...ux.intel.com>,
	<mika.westerberg@...ux.intel.com>,
	<jsd@...ihalf.com>,
	<Jose.Abreu@...opsys.com>,
	<andrew@...n.ch>,
	<hkallweit1@...il.com>,
	<linux@...linux.org.uk>,
	<linux-i2c@...r.kernel.org>,
	<linux-gpio@...r.kernel.org>,
	<mengyuanlou@...-swift.com>
Subject: RE: [PATCH net-next v9 8/9] net: txgbe: Implement phylink pcs

On Friday, May 26, 2023 12:14 PM, Jakub Kicinski wrote:
> On Wed, 24 May 2023 17:17:21 +0800 Jiawen Wu wrote:
> > +	ret = devm_mdiobus_register(&pdev->dev, mii_bus);
> > +	if (ret)
> > +		return ret;
> > +
> > +	mdiodev = mdio_device_create(mii_bus, 0);
> > +	if (IS_ERR(mdiodev))
> > +		return PTR_ERR(mdiodev);
> > +
> > +	xpcs = xpcs_create(mdiodev, PHY_INTERFACE_MODE_10GBASER);
> > +	if (IS_ERR(xpcs)) {
> > +		mdio_device_free(mdiodev);
> > +		return PTR_ERR(xpcs);
> > +	}
> 
> How does the mdiodev get destroyed in case of success?
> Seems like either freeing it in case of xpcs error is unnecessary
> or it needs to also be freed when xpcs is destroyed?

When xpcs is destroyed, that means mdiodev is no longer needed.
I think there is no need to free mdiodev in case of xpcs error,
since devm_* function leads to free it.