On 7/30/20 1:01 PM, Yuusuke Ashizuka wrote:
CCing DaveM (as you should have done from the start)...
> ravb is a module driver, but I cannot rmmod it after insmod it.
> ravb does mdio_init() at the time of probe, and module->refcnt is incremented
> by alloc_mdio_bitbang() called after that.
> Therefore, even if ifup is not performed, the driver is in use and rmmod cannot
> be performed.
>
> $ lsmod
> Module Size Used by
Did you also build mdio-bitbang.c as a module? For the in-kernal driver, not
being able to rmmod the 'ravb' one sounds logical. :-)
> ravb 40960 1
> $ rmmod ravb
> rmmod: ERROR: Module ravb is in use
>
> Fixed to execute mdio_init() at open and free_mdio() at close, thereby rmmod is
Call ravb_mdio_init() at open and free_mdio_bitbang() at close.
> possible in the ifdown state.
Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
> Signed-off-by: Yuusuke Ashizuka <ashiduka@xxxxxxxxxxx>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxx>
[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 99f7aae102ce..df89d09b253e 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -1342,6 +1342,51 @@ static inline int ravb_hook_irq(unsigned int irq, irq_handler_t handler,
> return error;
> }
>
> +/* MDIO bus init function */
> +static int ravb_mdio_init(struct ravb_private *priv)
> +{
> + struct platform_device *pdev = priv->pdev;
> + struct device *dev = &pdev->dev;
> + int error;
> +
> + /* Bitbang init */
> + priv->mdiobb.ops = &bb_ops;
> +
> + /* MII controller setting */
> + priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
> + if (!priv->mii_bus)
> + return -ENOMEM;
> +
> + /* Hook up MII support for ethtool */
> + priv->mii_bus->name = "ravb_mii";
> + priv->mii_bus->parent = dev;
> + snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
> + pdev->name, pdev->id);
> +
> + /* Register MDIO bus */
> + error = of_mdiobus_register(priv->mii_bus, dev->of_node);
> + if (error)
> + goto out_free_bus;
> +
> + return 0;
> +
> +out_free_bus:
> + free_mdio_bitbang(priv->mii_bus);
> + return error;
> +}
> +
> +/* MDIO bus release function */
> +static int ravb_mdio_release(struct ravb_private *priv)
> +{
> + /* Unregister mdio bus */
> + mdiobus_unregister(priv->mii_bus);
> +
> + /* Free bitbang info */
> + free_mdio_bitbang(priv->mii_bus);
> +
> + return 0;
> +}
> +
[...]
> @@ -1887,51 +1942,6 @@ static const struct net_device_ops ravb_netdev_ops = {
> .ndo_set_features = ravb_set_features,
> };
>
> -/* MDIO bus init function */
> -static int ravb_mdio_init(struct ravb_private *priv)
> -{
> - struct platform_device *pdev = priv->pdev;
> - struct device *dev = &pdev->dev;
> - int error;
> -
> - /* Bitbang init */
> - priv->mdiobb.ops = &bb_ops;
> -
> - /* MII controller setting */
> - priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb);
> - if (!priv->mii_bus)
> - return -ENOMEM;
> -
> - /* Hook up MII support for ethtool */
> - priv->mii_bus->name = "ravb_mii";
> - priv->mii_bus->parent = dev;
> - snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
> - pdev->name, pdev->id);
> -
> - /* Register MDIO bus */
> - error = of_mdiobus_register(priv->mii_bus, dev->of_node);
> - if (error)
> - goto out_free_bus;
> -
> - return 0;
> -
> -out_free_bus:
> - free_mdio_bitbang(priv->mii_bus);
> - return error;
> -}
> -
> -/* MDIO bus release function */
> -static int ravb_mdio_release(struct ravb_private *priv)
> -{
> - /* Unregister mdio bus */
> - mdiobus_unregister(priv->mii_bus);
> -
> - /* Free bitbang info */
> - free_mdio_bitbang(priv->mii_bus);
> -
> - return 0;
> -}
> -
Dave, would you tolerate the forward declarations here instead (to avoid the function moves, to be later
done in the net-next tree)?
[...]
MBR, Sergei
