linux-kernel - Re: [PATCH v3 13/19] media: dvb_core: slight optimization of addr compare

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Message-id: <20140107115438.02c7424e@samsung.com>
Date:	Tue, 07 Jan 2014 11:54:38 -0200
From:	Mauro Carvalho Chehab <m.chehab@...sung.com>
To:	Ding Tianhong <dingtianhong@...wei.com>
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	linux-media@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v3 13/19] media: dvb_core: slight optimization of addr
 compare

Em Thu, 26 Dec 2013 19:09:10 +0800
Ding Tianhong <dingtianhong@...wei.com> escreveu:

> On 2013/12/25 18:57, Sergei Shtylyov wrote:
> > Hello.
> > 
> > On 25-12-2013 7:29, Ding Tianhong wrote:
> > 
> >> Use possibly more efficient ether_addr_equal
> >> instead of memcmp.
> > 
> >> Cc: Mauro Carvalho Chehab <m.chehab@...sung.com>
> >> Cc: linux-media@...r.kernel.org
> >> Cc: linux-kernel@...r.kernel.org
> >> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> >> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
> >> ---
> >>   drivers/media/dvb-core/dvb_net.c | 8 ++++----
> >>   1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> >> diff --git a/drivers/media/dvb-core/dvb_net.c b/drivers/media/dvb-core/dvb_net.c
> >> index f91c80c..3dfc33b 100644
> >> --- a/drivers/media/dvb-core/dvb_net.c
> >> +++ b/drivers/media/dvb-core/dvb_net.c
> >> @@ -179,7 +179,7 @@ static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
> >>       eth = eth_hdr(skb);
> >>
> >>       if (*eth->h_dest & 1) {
> >> -        if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
> >> +        if(ether_addr_equal(eth->h_dest,dev->broadcast))
> > 
> >    There should be space after comma.
> > 
> >> @@ -674,11 +674,11 @@ static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
> >>                       if (priv->rx_mode != RX_MODE_PROMISC) {
> >>                           if (priv->ule_skb->data[0] & 0x01) {
> >>                               /* multicast or broadcast */
> >> -                            if (memcmp(priv->ule_skb->data, bc_addr, ETH_ALEN)) {
> >> +                            if (!ether_addr_equal(priv->ule_skb->data, bc_addr)) {
> >>                                   /* multicast */
> >>                                   if (priv->rx_mode == RX_MODE_MULTI) {
> >>                                       int i;
> >> -                                    for(i = 0; i < priv->multi_num && memcmp(priv->ule_skb->data, priv->multi_macs[i], ETH_ALEN); i++)
> >> +                                    for(i = 0; i < priv->multi_num && !ether_addr_equal(priv->ule_skb->data, priv->multi_macs[i]); i++)
> > 
> >    Shouldn't this line be broken?
> > 
> 
> ok, thanks.

Also, since you're touching on those lines, could you please add an space
after 'if' (on the first hunk) and after 'for' (on the second one)?

> 
> Regards
> >>                                           ;
> >>                                       if (i == priv->multi_num)
> >>                                           drop = 1;
> > 
> > WBR, Sergei
> > 
> > 
> > 
> > 
> 
> 
> --
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Thanks,
Mauro
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