netdev - Re: [PATCH v2] net: ethernet: aquantia: set net

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Message-ID: <285b77bc-f7d1-9ad6-1bc6-639f13ff9b83@gmx.de>
Date:   Thu, 9 Mar 2017 23:43:01 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     David Arcari <darcari@...hat.com>, netdev@...r.kernel.org
Cc:     Pavel Belous <Pavel.Belous@...antia.com>
Subject: Re: [PATCH v2] net: ethernet: aquantia: set net_device mtu when mtu
 is changed

Hi,

On 09.03.2017 22:03, David Arcari wrote:
> When the aquantia device mtu is changed the net_device structure is not
> updated.  As a result the ip command does not properly reflect the mtu change.
> 
> Commit 5513e16421cb incorrectly assumed that __dev_set_mtu() was making the
> assignment ndev->mtu = new_mtu;  This is not true in the case where the driver
> has a ndo_change_mtu routine.
> 
> Fixes: 5513e16421cb ("net: ethernet: aquantia: Fixes for aq_ndev_change_mtu")
> 
> v2: no longer close/open net-device after mtu change
> 
> Cc: Pavel Belous <Pavel.Belous@...antia.com>
> Signed-off-by: David Arcari <darcari@...hat.com>
> ---
>  drivers/net/ethernet/aquantia/atlantic/aq_main.c | 10 ++--------
>  1 file changed, 2 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_main.c b/drivers/net/ethernet/aquantia/atlantic/aq_main.c
> index dad6362..bba5ebd 100644
> --- a/drivers/net/ethernet/aquantia/atlantic/aq_main.c
> +++ b/drivers/net/ethernet/aquantia/atlantic/aq_main.c
> @@ -96,15 +96,9 @@ static int aq_ndev_change_mtu(struct net_device *ndev, int new_mtu)
>  	struct aq_nic_s *aq_nic = netdev_priv(ndev);
>  	int err = aq_nic_set_mtu(aq_nic, new_mtu + ETH_HLEN);
>  
> -	if (err < 0)
> -		goto err_exit;
> +	if (!err)
> +		ndev->mtu = new_mtu;
>  
> -	if (netif_running(ndev)) {
> -		aq_ndev_close(ndev);
> -		aq_ndev_open(ndev);
> -	}
> -
> -err_exit:

Removing the restart has nothing to do with the bug you want to fix here, has it?
I suggest to send a separate patch for this.

Regards,
Lino