openvswitch: switch from WARN to pr_warn

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2163374
Upstream Status: linux.git

commit fd954cc
Author: Aaron Conole <aconole@redhat.com>
Date:   Tue Oct 25 06:50:17 2022 -0400

    openvswitch: switch from WARN to pr_warn

    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: 44da5ae ("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>
    Acked-by: Ilya Maximets <i.maximets@ovn.org>
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Antoine Tenart <atenart@redhat.com>

Author: atenart

net/openvswitch/datapath.c

@@ -1614,7 +1614,8 @@ 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;
 }