linux-kernel - Re: [PATCH] Revert "net: ethernet: ixgbe: check the return value of ixgbe_mii_bus

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Date:   Fri, 25 Sep 2020 10:14:59 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Yongxin Liu <yongxin.liu@...driver.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "net: ethernet: ixgbe: check the return value of ixgbe_mii_bus_init()"

On Fri, Sep 25, 2020 at 4:45 AM Yongxin Liu <yongxin.liu@...driver.com> wrote:
>
> This reverts commit 09ef193fef7efb0175a04634853862d717adbb95.
>
> For C3000 family of SoCs, they have four ixgbe devices sharing a single MDIO bus.
> ixgbe_mii_bus_init() returns -ENODEV for other three devices. The propagation
> of the error code makes other three ixgbe devices unregistered.
>
> Signed-off-by: Yongxin Liu <yongxin.liu@...driver.com>
> ---
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index 2f8a4cfc5fa1..5e5223becf86 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -11031,14 +11031,10 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>                         IXGBE_LINK_SPEED_10GB_FULL | IXGBE_LINK_SPEED_1GB_FULL,
>                         true);
>
> -       err = ixgbe_mii_bus_init(hw);
> -       if (err)
> -               goto err_netdev;
> +       ixgbe_mii_bus_init(hw);
>
>         return 0;
>
> -err_netdev:
> -       unregister_netdev(netdev);
>  err_register:
>         ixgbe_release_hw_control(adapter);
>         ixgbe_clear_interrupt_scheme(adapter);
> --
> 2.14.4
>

Then we should check if err == -ENODEV, not outright ignore all
potential errors, right?

Bartosz