netdev - Re: [PATCH] net: adaptec: remove dead code in set_vlan

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Message-ID: <20201120151714.0cc2f00b@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 20 Nov 2020 15:17:14 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     xiakaixu1987@...il.com, Ion Badulescu <ionut@...ula.org>
Cc:     ionut@...ula.org, leon@...nel.org, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kaixu Xia <kaixuxia@...cent.com>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] net: adaptec: remove dead code in set_vlan_mode

On Fri, 20 Nov 2020 15:50:00 +0800 xiakaixu1987@...il.com wrote:
> From: Kaixu Xia <kaixuxia@...cent.com>
> 
> The body of the if statement can be executed only when the variable
> vlan_count equals to 32, so the condition of the while statement can
> not be true and the while statement is dead code. Remove it.
> 
> Reported-by: Tosk Robot <tencent_os_robot@...cent.com>
> Signed-off-by: Kaixu Xia <kaixuxia@...cent.com>
> ---
>  drivers/net/ethernet/adaptec/starfire.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/adaptec/starfire.c b/drivers/net/ethernet/adaptec/starfire.c
> index 555299737b51..ad27a9fa5e95 100644
> --- a/drivers/net/ethernet/adaptec/starfire.c
> +++ b/drivers/net/ethernet/adaptec/starfire.c
> @@ -1754,14 +1754,9 @@ static u32 set_vlan_mode(struct netdev_private *np)
>  		filter_addr += 16;
>  		vlan_count++;
>  	}
> -	if (vlan_count == 32) {
> +	if (vlan_count == 32)
>  		ret |= PerfectFilterVlan;
> -		while (vlan_count < 32) {
> -			writew(0, filter_addr);
> -			filter_addr += 16;
> -			vlan_count++;
> -		}
> -	}
> +
>  	return ret;
>  }
>  #endif /* VLAN_SUPPORT */

This got broken back in 2011:

commit 5da96be53a16a62488316810d0c7c5d58ce3ee4f
Author: Jiri Pirko <jpirko@...hat.com>
Date:   Wed Jul 20 04:54:31 2011 +0000

    starfire: do vlan cleanup
    
    - unify vlan and nonvlan rx path
    - kill np->vlgrp and netdev_vlan_rx_register
    
    Signed-off-by: Jiri Pirko <jpirko@...hat.com>
    Signed-off-by: David S. Miller <davem@...emloft.net>

The comparison to 32 was on a different variable before that change.

Ion, do you think anyone is still using this driver?

Maybe it's time we put it in the history book (by which I mean remove
from the kernel).