netdev - Re: [PATCH 1/2] net: dsa: Error out on tagging protocol mismatches

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Date:	Wed, 22 Oct 2014 16:46:52 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Andrew Lunn <andrew@...n.ch>, davem@...emloft.net
CC:	netdev@...r.kernel.org, alexander.h.duyck@...el.com
Subject: Re: [PATCH 1/2] net: dsa: Error out on tagging protocol mismatches

On 10/22/2014 04:35 PM, Andrew Lunn wrote:
> If there is a mismatch between enabled tagging protocols and the
> protocol the switch supports, error out, rather than continue with a
> situation which is unlikely to work.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> cc: alexander.h.duyck@...el.com
> ---
>  net/dsa/dsa.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 22f34cf4cb27..8a31bd81a315 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -175,7 +175,8 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
>  			break;
>  #endif
>  		default:
> -			break;
> +			ret = -ENOPROTOOPT;
> +			goto out;
>  		}

This prevents using a switch driver without tagging, which is something
that you might want to do (link setup, ethtool stats, EEE etc...).
--
Florian

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