Hi Uli, thanks for the patch.
On Tue, Aug 20, 2019 at 09:01:26PM +0200, Ulrich Hecht wrote:
> Uses the same method as various other drivers: shut the device down,
> change the MTU, then bring it back up again.
>
> Tested on Renesas D3 Draak and M3-W Salvator-X boards.
>
> Signed-off-by: Ulrich Hecht <uli+rene...@fpond.eu>
> Reviewed-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
> Reviewed-by: Geert Uytterhoeven <geert+rene...@glider.be>
> Reviewed-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>
Are these reviews left from v2? If so, I'd prefer to see them given
again because the logic was changed in v3.
> ---
>
> Hi!
>
> This revision reverts the MTU change if re-opening the device fails.
>
> CU
> Uli
>
>
> drivers/net/ethernet/renesas/ravb_main.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c
> b/drivers/net/ethernet/renesas/ravb_main.c
> index ef8f089..402bcec 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -1810,12 +1810,24 @@ static int ravb_do_ioctl(struct net_device *ndev,
> struct ifreq *req, int cmd)
>
> static int ravb_change_mtu(struct net_device *ndev, int new_mtu)
> {
> + unsigned int old_mtu = ndev->mtu;
> +
> if (netif_running(ndev))
> - return -EBUSY;
> + ravb_close(ndev);
>
> ndev->mtu = new_mtu;
> netdev_update_features(ndev);
>
> + if (netif_running(ndev)) {
> + int err = ravb_open(ndev);
> +
> + if (err) {
> + ndev->mtu = old_mtu;
> + netdev_update_features(ndev);
> + return err;
> + }
> + }
> +
> return 0;
> }
>
> --
> 2.7.4
>
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