Re: [PATCH net-next v7 2/7] net: stmmac: Add dedicated XPCS cleanup method

[Serge Semin]

Hi Romain

On Mon, May 13, 2024 at 09:25:13AM +0200, Romain Gantois wrote:
> From: Serge Semin <fancer.lancer@xxxxxxxxx>
> 
> Currently the XPCS handler destruction is performed in the
> stmmac_mdio_unregister() method. It doesn't look good because the handler
> isn't originally created in the corresponding protagonist
> stmmac_mdio_unregister(), but in the stmmac_xpcs_setup() function. In
> order to have more coherent MDIO and XPCS setup/cleanup procedures,
> let's move the DW XPCS destruction to the dedicated stmmac_pcs_clean()
> method.
> 
> This method will also be used to cleanup PCS hardware using the
> pcs_exit() callback that will be introduced to stmmac in a subsequent
> patch.
> 
> Signed-off-by: Serge Semin <fancer.lancer@xxxxxxxxx>
> Co-developed-by: Romain Gantois <romain.gantois@xxxxxxxxxxx>
> Signed-off-by: Romain Gantois <romain.gantois@xxxxxxxxxxx>
> Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>

Looking good. Thanks!
* Not sure whether my explicit Rb tag will be required in such the tags
disposition.)

-Serge(y)

> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac.h      |  1 +
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |  6 +++++-
>  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 14 +++++++++++---
>  3 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> index dddcaa9220cc3..badfe686a5702 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> @@ -361,6 +361,7 @@ int stmmac_mdio_unregister(struct net_device *ndev);
>  int stmmac_mdio_register(struct net_device *ndev);
>  int stmmac_mdio_reset(struct mii_bus *mii);
>  int stmmac_xpcs_setup(struct mii_bus *mii);
> +void stmmac_pcs_clean(struct net_device *ndev);
>  void stmmac_set_ethtool_ops(struct net_device *netdev);
>  
>  int stmmac_init_tstamp_counter(struct stmmac_priv *priv, u32 systime_flags);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 3d828904db0d3..0ac99c132733d 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -7789,8 +7789,9 @@ int stmmac_dvr_probe(struct device *device,
>  
>  error_netdev_register:
>  	phylink_destroy(priv->phylink);
> -error_xpcs_setup:
>  error_phy_setup:
> +	stmmac_pcs_clean(ndev);
> +error_xpcs_setup:
>  	if (priv->hw->pcs != STMMAC_PCS_TBI &&
>  	    priv->hw->pcs != STMMAC_PCS_RTBI)
>  		stmmac_mdio_unregister(ndev);
> @@ -7832,6 +7833,9 @@ void stmmac_dvr_remove(struct device *dev)
>  	if (priv->plat->stmmac_rst)
>  		reset_control_assert(priv->plat->stmmac_rst);
>  	reset_control_assert(priv->plat->stmmac_ahb_rst);
> +
> +	stmmac_pcs_clean(ndev);
> +
>  	if (priv->hw->pcs != STMMAC_PCS_TBI &&
>  	    priv->hw->pcs != STMMAC_PCS_RTBI)
>  		stmmac_mdio_unregister(ndev);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index 0542cfd1817e6..73ba9901a4439 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -523,6 +523,17 @@ int stmmac_xpcs_setup(struct mii_bus *bus)
>  	return 0;
>  }
>  
> +void stmmac_pcs_clean(struct net_device *ndev)
> +{
> +	struct stmmac_priv *priv = netdev_priv(ndev);
> +
> +	if (!priv->hw->xpcs)
> +		return;
> +
> +	xpcs_destroy(priv->hw->xpcs);
> +	priv->hw->xpcs = NULL;
> +}
> +
>  /**
>   * stmmac_mdio_register
>   * @ndev: net device structure
> @@ -679,9 +690,6 @@ int stmmac_mdio_unregister(struct net_device *ndev)
>  	if (!priv->mii)
>  		return 0;
>  
> -	if (priv->hw->xpcs)
> -		xpcs_destroy(priv->hw->xpcs);
> -
>  	mdiobus_unregister(priv->mii);
>  	priv->mii->priv = NULL;
>  	mdiobus_free(priv->mii);
> 
> -- 
> 2.44.0
>