netdev - Re: [PATCH 1/2 net-next v3.16]r8169: Disable set bit multicast enable per multicast address.

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Date:	Sat, 26 Mar 2016 10:18:46 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Corcodel Marian <asd@...ian1000.go.ro>
Cc:	netdev@...r.kernel.org, Francois Romieu <romieu@...zoreil.com>
Subject: Re: [PATCH 1/2 net-next v3.16]r8169:  Disable set bit multicast
 enable per multicast address.

On Sat, 2016-03-26 at 12:57 +0200, Corcodel Marian wrote:
>  This patch correct set bit multicast enable only once per set_rx_mode
>  invocation.
> 
> Signed-off-by: Corcodel Marian <asd@...ian1000.go.ro>
> ---
>  drivers/net/ethernet/realtek/r8169.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
> index 7f6fb1f..f7b0dfb 100644
> --- a/drivers/net/ethernet/realtek/r8169.c
> +++ b/drivers/net/ethernet/realtek/r8169.c
> @@ -4619,12 +4619,11 @@ static void rtl_set_rx_mode(struct net_device *dev)
>  	} else {
>  		struct netdev_hw_addr *ha;
>  
> -		rx_mode = AcceptBroadcast | AcceptMyPhys;
> +		rx_mode = AcceptBroadcast | AcceptMyPhys | AcceptMulticast;
>  		mc_filter[1] = mc_filter[0] = 0;
>  		netdev_for_each_mc_addr(ha, dev) {
>  			int bit_nr = ether_crc(ETH_ALEN, ha->addr) >> 26;
>  			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
> -			rx_mode |= AcceptMulticast;
>  		}
>  	}
>  

If the list is empty, why should we enable AcceptMulticast ?