linux-kernel - Re: [PATCH 0/2] net: phy: relax error checking when creating sysfs link netdev->phydev

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Message-ID: <c790757c-0b4f-575b-1f6a-5f870f840e20@gmail.com>
Date:   Fri, 16 Mar 2018 14:09:52 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: Re: [PATCH 0/2] net: phy: relax error checking when creating sysfs
 link netdev->phydev

On 03/16/2018 01:13 PM, Grygorii Strashko wrote:
> 
> 
> On 03/16/2018 02:54 PM, Andrew Lunn wrote:
>>> The phydrv->mdiodrv.flags can be accessible only after call to of_phy_connect()/phy_connect(),
>>
>> You need to use a function like of_phy_find_device() to get the
>> phydev, set the flag, and then call phy_connect_direct().
> 
> 
> So, do you propose me to replace direct calls of of_phy_connect()/phy_connect() in
> CPSW driver with buddies of the same functions? Right?
> 
> cpsw_slave_open()
> {
> ....
> 	if (slave->data->phy_node) {
> 		phy = of_phy_connect(priv->ndev, slave->data->phy_node,
> 				 &cpsw_adjust_link, 0, slave->data->phy_if);
> ----- replace ^^^^ with below
> {
> 	struct phy_device *phy = of_phy_find_device(phy_np);
> 	int ret;
> 
> 	if (!phy)
> 		return NULL;
> 
> 	phy->dev_flags = flags;
> 
> -----	[set flag in phydrv->mdiodrv.flags]
> 
> 	ret = phy_connect_direct(dev, phy, hndlr, iface);
> 
> 	/* refcount is held by phy_connect_direct() on success */
> 	put_device(&phy->mdio.dev);
> 
> 	return ret ? NULL : phy;
> }
> -----
> 		if (!phy) {
> 			dev_err(priv->dev, "phy \"%pOF\" not found on slave %d\n",
> 				slave->data->phy_node,
> 				slave->slave_num);
> 			return;
> 		}
> 	} else {
> 		phy = phy_connect(priv->ndev, slave->data->phy_id,
> 				 &cpsw_adjust_link, slave->data->phy_if);
> ----- replace ^^^^ with below
> {
> 	struct phy_device *phydev;
> 	struct device *d;
> 	int rc;
> 
> 	/* Search the list of PHY devices on the mdio bus for the
> 	 * PHY with the requested name
> 	 */
> 	d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
> 	if (!d) {
> 		pr_err("PHY %s not found\n", bus_id);
> 		return ERR_PTR(-ENODEV);
> 	}
> 	phydev = to_phy_device(d);
> 
> -----	[set flag in phydrv->mdiodrv.flags]
> 
> 	rc = phy_connect_direct(dev, phydev, handler, interface);
> 	put_device(d);
> 	if (rc)
> 		return ERR_PTR(rc);
> 
> 	return phydev;
> }
> -----
> 		if (IS_ERR(phy)) {
> 			dev_err(priv->dev,
> 				"phy \"%s\" not found on slave %d, err %ld\n",
> 				slave->data->phy_id, slave->slave_num,
> 				PTR_ERR(phy));
> 			return;
> 		}
> 	}
> }
> 
> and all above just to set a flag which will be used by just one driver as of now.
> 
> Hm. Is this some sort of punishment ;) Sry. I'll probably will take a pause.

I agree, let's not have you run into circles, let's just use your
patches as they are since they fix the problem and are not intrusive in
any way.
-- 
Florian