netdev - Re: [PATCH net] geneve: use ipv6_mod_enabled to check if ipv6 is disabled

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Message-ID: <00742c9b-9cf8-1025-2c3a-0684cd8f6c7f@cumulusnetworks.com>
Date:   Mon, 25 Feb 2019 09:57:08 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org
Cc:     Stefano Brivio <sbrivio@...hat.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net] geneve: use ipv6_mod_enabled to check if ipv6 is
 disabled

On 2/24/19 9:13 PM, Hangbin Liu wrote:
> ipv6_mod_enabled() is more safe and gentle to check if ipv6 is disabled
> at running time.
> 
> Fixes: c0a47e44c098 ("geneve: should not call rt6_lookup() when ipv6 was disabled")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  drivers/net/geneve.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
> index 3377ac66a347..42c5e43ece68 100644
> --- a/drivers/net/geneve.c
> +++ b/drivers/net/geneve.c
> @@ -1514,7 +1514,7 @@ static void geneve_link_config(struct net_device *dev,
>  	case AF_INET6: {
>  		struct rt6_info *rt;
>  
> -		if (!__in6_dev_get(dev))
> +		if (!ipv6_mod_enabled())
>  			break;
>  
>  		rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
> 

seems to me the existing check is more appropriate and relevant for the
code path: is ipv6 enabled on this device versus is ipv6 enabled at all.