Re: [PATCH net v2 1/3] drivers: net: cpsw: fix parsing of phy-handle DT property in dual_emac config

[Grygorii Strashko]

On 04/21/2016 09:19 PM, David Rivshin (Allworx) wrote:
> From: David Rivshin <drivshin@xxxxxxxxxxx>
>
> Commit 9e42f715264ff158478fa30eaed847f6e131366b ("drivers: net: cpsw: add
> phy-handle parsing") saved the "phy-handle" phandle into a new cpsw_priv
> field. However, phy connections are per-slave, so the phy_node field should
> be in cpsw_slave_data rather than cpsw_priv.
>
> This would go unnoticed in a single emac configuration. But in dual_emac
> mode, the last "phy-handle" property parsed for either slave would be used
> by both of them, causing them both to refer to the same phy_device.
>
> Fixes: 9e42f715264f ("drivers: net: cpsw: add phy-handle parsing")
> Signed-off-by: David Rivshin <drivshin@xxxxxxxxxxx>
> Tested-by: Nicolas Chauvet <kwizart@xxxxxxxxx>
> ---
> I would suggest this for -stable. It should apply cleanly as far back
> as 4.4.
>
> Changes since v1 [1]:
> - Rebased (no conflicts)
> - Added Tested-by from Nicolas Chauvet
>
> [1] https://patchwork.ozlabs.org/patch/560326/

Reviewed-by: Grygorii Strashko <grygorii.strashko@xxxxxx>

>   drivers/net/ethernet/ti/cpsw.c | 13 ++++++-------
>   drivers/net/ethernet/ti/cpsw.h |  1 +
>   2 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 42fdfd4..d69cb3f 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -363,15 +363,14 @@ static inline void slave_write(struct cpsw_slave *slave, u32 val, u32 offset)
>   	__raw_writel(val, slave->regs + offset);
>   }
>
>   struct cpsw_priv {
>   	spinlock_t			lock;
>   	struct platform_device		*pdev;
>   	struct net_device		*ndev;
> -	struct device_node		*phy_node;
>   	struct napi_struct		napi_rx;
>   	struct napi_struct		napi_tx;
>   	struct device			*dev;
>   	struct cpsw_platform_data	data;
>   	struct cpsw_ss_regs __iomem	*regs;
>   	struct cpsw_wr_regs __iomem	*wr_regs;
>   	u8 __iomem			*hw_stats;
> @@ -1144,16 +1143,16 @@ static void cpsw_slave_open(struct cpsw_slave *slave, struct cpsw_priv *priv)
>
>   	if (priv->data.dual_emac)
>   		cpsw_add_dual_emac_def_ale_entries(priv, slave, slave_port);
>   	else
>   		cpsw_ale_add_mcast(priv->ale, priv->ndev->broadcast,
>   				   1 << slave_port, 0, 0, ALE_MCAST_FWD_2);
>
> -	if (priv->phy_node)
> -		slave->phy = of_phy_connect(priv->ndev, priv->phy_node,
> +	if (slave->data->phy_node)
> +		slave->phy = of_phy_connect(priv->ndev, slave->data->phy_node,
>   				 &cpsw_adjust_link, 0, slave->data->phy_if);
>   	else
>   		slave->phy = phy_connect(priv->ndev, slave->data->phy_id,
>   				 &cpsw_adjust_link, slave->data->phy_if);
>   	if (IS_ERR(slave->phy)) {
>   		dev_err(priv->dev, "phy %s not found on slave %d\n",
>   			slave->data->phy_id, slave->slave_num);
> @@ -1936,20 +1935,19 @@ static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv,
>
>   	slave->data	= data;
>   	slave->regs	= regs + slave_reg_ofs;
>   	slave->sliver	= regs + sliver_reg_ofs;
>   	slave->port_vlan = data->dual_emac_res_vlan;
>   }
>
> -static int cpsw_probe_dt(struct cpsw_priv *priv,
> +static int cpsw_probe_dt(struct cpsw_platform_data *data,
>   			 struct platform_device *pdev)
>   {
>   	struct device_node *node = pdev->dev.of_node;
>   	struct device_node *slave_node;
> -	struct cpsw_platform_data *data = &priv->data;
>   	int i = 0, ret;
>   	u32 prop;
>
>   	if (!node)
>   		return -EINVAL;
>
>   	if (of_property_read_u32(node, "slaves", &prop)) {
> @@ -2029,15 +2027,16 @@ static int cpsw_probe_dt(struct cpsw_priv *priv,
>   		int lenp;
>   		const __be32 *parp;
>
>   		/* This is no slave child node, continue */
>   		if (strcmp(slave_node->name, "slave"))
>   			continue;
>
> -		priv->phy_node = of_parse_phandle(slave_node, "phy-handle", 0);
> +		slave_data->phy_node = of_parse_phandle(slave_node,
> +							"phy-handle", 0);
>   		parp = of_get_property(slave_node, "phy_id", &lenp);
>   		if (of_phy_is_fixed_link(slave_node)) {
>   			struct device_node *phy_node;
>   			struct phy_device *phy_dev;
>
>   			/* In the case of a fixed PHY, the DT node associated
>   			 * to the PHY is the Ethernet MAC DT node.
> @@ -2271,15 +2270,15 @@ static int cpsw_probe(struct platform_device *pdev)
>   	 * This may be required here for child devices.
>   	 */
>   	pm_runtime_enable(&pdev->dev);
>
>   	/* Select default pin state */
>   	pinctrl_pm_select_default_state(&pdev->dev);
>
> -	if (cpsw_probe_dt(priv, pdev)) {
> +	if (cpsw_probe_dt(&priv->data, pdev)) {
>   		dev_err(&pdev->dev, "cpsw: platform data missing\n");
>   		ret = -ENODEV;
>   		goto clean_runtime_disable_ret;
>   	}
>   	data = &priv->data;
>
>   	if (is_valid_ether_addr(data->slave_data[0].mac_addr)) {
> diff --git a/drivers/net/ethernet/ti/cpsw.h b/drivers/net/ethernet/ti/cpsw.h
> index 442a703..e50afd1 100644
> --- a/drivers/net/ethernet/ti/cpsw.h
> +++ b/drivers/net/ethernet/ti/cpsw.h
> @@ -14,14 +14,15 @@
>   #ifndef __CPSW_H__
>   #define __CPSW_H__
>
>   #include <linux/if_ether.h>
>   #include <linux/phy.h>
>
>   struct cpsw_slave_data {
> +	struct device_node *phy_node;
>   	char		phy_id[MII_BUS_ID_SIZE];
>   	int		phy_if;
>   	u8		mac_addr[ETH_ALEN];
>   	u16		dual_emac_res_vlan;	/* Reserved VLAN for DualEMAC */
>   };
>
>   struct cpsw_platform_data {


--
regards,
-grygorii