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SubjectRe: [net-next PATCH v2 3/3] phylink: Introduce phylink_fwnode_phy_connect()
On Mon, Apr 27, 2020 at 06:54:09PM +0530, Calvin Johnson wrote:
> Define phylink_fwnode_phy_connect() to connect phy specified by
> a fwnode to a phylink instance. Additionally,
> phylink_device_phy_connect() is defined to connect phy specified
> by a device to a phylink instance.
>
> Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
> ---
>
> Changes in v2:
> replace of_ and acpi_ code with generic fwnode to get phy-handle.
>
> drivers/net/phy/phylink.c | 68 +++++++++++++++++++++++++++++++++++++++
> include/linux/phylink.h | 6 ++++
> 2 files changed, 74 insertions(+)
>
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 0f23bec431c1..5eab1eadded7 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -961,6 +961,74 @@ int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
> }
> EXPORT_SYMBOL_GPL(phylink_connect_phy);
>
> +/**
> + * phylink_fwnode_phy_connect() - connect the PHY specified in the fwnode.
> + * @pl: a pointer to a &struct phylink returned from phylink_create()
> + * @fwnode: a pointer to a &struct fwnode_handle.
> + * @flags: PHY-specific flags to communicate to the PHY device driver
> + *
> + * Connect the phy specified @fwnode to the phylink instance specified
> + * by @pl. Actions specified in phylink_connect_phy() will be
> + * performed.
> + *
> + * Returns 0 on success or a negative errno.
> + */
> +int phylink_fwnode_phy_connect(struct phylink *pl,
> + struct fwnode_handle *fwnode,
> + u32 flags)
> +{
> + struct fwnode_handle *phy_fwnode;
> + struct phy_device *phy_dev;
> + int ret = 0;
> +
> + /* Fixed links and 802.3z are handled without needing a PHY */
> + if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
> + (pl->cfg_link_an_mode == MLO_AN_INBAND &&
> + phy_interface_mode_is_8023z(pl->link_interface)))
> + return 0;
> +
> + phy_fwnode = fwnode_get_phy_node(fwnode);
> + if ((IS_ERR_OR_NULL(phy_fwnode)) && (pl->cfg_link_an_mode == MLO_AN_PHY))

According to your documentation for fwnode_get_phy_node(), it can't
return NULL. So, use of IS_ERR_OR_NULL() is incorrect here. Please
also eliminate the unnecessary parens to match the style in the rest
of this file.

> + return -ENODEV;

If fwnode_get_phy_node() returns an error pointer, shouldn't you be
propagating that error here?

> +
> + phy_dev = fwnode_phy_find_device(phy_fwnode);
> + fwnode_handle_put(phy_fwnode);
> + if (!phy_dev)
> + return -ENODEV;
> +
> + ret = phy_attach_direct(pl->netdev, phy_dev, flags,
> + pl->link_interface);
> + if (ret)
> + return ret;
> +
> + ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
> + if (ret)
> + phy_detach(phy_dev);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(phylink_fwnode_phy_connect);
> +
> +/**
> + * phylink_device_phy_connect() - connect the PHY specified by the device.
> + * @pl: a pointer to a &struct phylink returned from phylink_create()
> + * @dev: a pointer to a &struct device.
> + * @flags: PHY-specific flags to communicate to the PHY device driver
> + *
> + * Connect the phy specified by the device to the phylink instance specified
> + * by @pl. Actions specified in phylink_connect_phy() will be
> + * performed.
> + *
> + * Returns 0 on success or a negative errno.
> + */
> +int phylink_device_phy_connect(struct phylink *pl,
> + struct device *dev,
> + u32 flags)
> +{
> + return phylink_fwnode_phy_connect(pl, dev_fwnode(dev), flags);
> +}
> +EXPORT_SYMBOL_GPL(phylink_device_phy_connect);

If this has any users, I think this should be an inline function in
phylink.h - it's just a helper after all. If it doesn't then it should
just be dropped.

Thanks.

--
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