netdev - RE: [PATCH net-next v2 1/6] be2net: skip multicast promiscuos setting in already set

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Date:	Mon, 2 Jun 2014 04:44:48 +0000
From:	Sathya Perla <Sathya.Perla@...lex.Com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next v2 1/6] be2net: skip multicast promiscuos
 setting in already set



> -----Original Message-----
> From: Sergei Shtylyov [mailto:sergei.shtylyov@...entembedded.com]
> 
> Hello.
> 
> On 05/30/2014 05:36 PM, Sathya Perla wrote:
> 
> > From: Kalesh AP <kalesh.purayil@...lex.com>
> 
> > Set mc-promisc (multicast promiscuous) mode on an interface, only if it is
> > *not already* in that mode.
> 
> > Also removed logs that report interface being set to multicast
> > promiscous mode. In an earlier comment on the netdev list such log
> messages
> > were deemed unnecessary as this behaviour is common across most of the
> > ethernet drivers.
> 
> > Signed-off-by: Kalesh AP <kalesh.purayil@...lex.com>
> > Signed-off-by: Sathya Perla <sathya.perla@...lex.com>
> 
> [...]
> 
> > diff --git a/drivers/net/ethernet/emulex/benet/be_main.c
> b/drivers/net/ethernet/emulex/benet/be_main.c
> > index e1d445d..9116d5e 100644
> > --- a/drivers/net/ethernet/emulex/benet/be_main.c
> > +++ b/drivers/net/ethernet/emulex/benet/be_main.c
> [...]
> > @@ -1244,15 +1242,22 @@ static void be_set_rx_mode(struct net_device
> *netdev)
> >   	}
> >
> >   	status = be_cmd_rx_filter(adapter, IFF_MULTICAST, ON);
> > -
> > -	/* Set to MCAST promisc mode if setting MULTICAST address fails */
> > -	if (status) {
> > -		dev_info(&adapter->pdev->dev,
> > -			 "Exhausted multicast HW filters.\n");
> > -		dev_info(&adapter->pdev->dev,
> > -			 "Disabling HW multicast filtering.\n");
> > -		be_cmd_rx_filter(adapter, IFF_ALLMULTI, ON);
> > +	if (!status) {
> > +		if (adapter->flags & BE_FLAGS_MCAST_PROMISC)
> > +			adapter->flags &= ~BE_FLAGS_MCAST_PROMISC;
> 
>     Why not just clear it without prior check?
> 

Yes, can be done. But, what is wrong with clearing the flag after the check ?
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