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Message-ID: <b0495014-0673-1ac3-5c9f-b12f947d9cb2@ovn.org>
Date:   Thu, 20 Oct 2022 20:40:07 +0200
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Cc:     i.maximets@ovn.org, Pravin B Shelar <pshelar@ovn.org>,
        Jakub Kicinski <kuba@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Paolo Abeni <pabeni@redhat.com>,
        Eric Dumazet <edumazet@google.com>,
        Thomas Graf <tgraf@suug.ch>,
        Kevin Sprague <ksprague0711@gmail.com>, dev@openvswitch.org,
        Eelco Chaudron <echaudro@redhat.com>,
        Shuah Khan <shuah@kernel.org>, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org
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To:     Aaron Conole <aconole@redhat.com>, netdev@vger.kernel.org
References: <20221019183054.105815-1-aconole@redhat.com>
 <20221019183054.105815-2-aconole@redhat.com>
From:   Ilya Maximets <i.maximets@ovn.org>
Subject: Re: [PATCH net 1/2] openvswitch: switch from WARN to pr_warn
In-Reply-To: <20221019183054.105815-2-aconole@redhat.com>
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On 10/19/22 20:30, Aaron Conole wrote:
> As noted by Paolo Abeni, pr_warn doesn't generate any splat and can still
> preserve the warning to the user that feature downgrade occurred.  We
> likely cannot introduce other kinds of checks / enforcement here because
> syzbot can generate different genl versions to the datapath.
> 
> Reported-by: syzbot+31cde0bef4bbf8ba2d86@syzkaller.appspotmail.com
> Fixes: 44da5ae5fbea ("openvswitch: Drop user features if old user space attempted to create datapath")
> Cc: Thomas Graf <tgraf@suug.ch>
> Signed-off-by: Aaron Conole <aconole@redhat.com>
> ---
>  net/openvswitch/datapath.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
> index c8a9075ddd0a..155263e73512 100644
> --- a/net/openvswitch/datapath.c
> +++ b/net/openvswitch/datapath.c
> @@ -1616,7 +1616,8 @@ static void ovs_dp_reset_user_features(struct sk_buff *skb,
>  	if (IS_ERR(dp))
>  		return;
>  
> -	WARN(dp->user_features, "Dropping previously announced user features\n");
> +	pr_warn("%s: Dropping previously announced user features\n",
> +		ovs_dp_name(dp));
>  	dp->user_features = 0;
>  }
>  

Works fine.  Thanks!

Acked-by: Ilya Maximets <i.maximets@ovn.org>