linux-kernel - Re: [PATCH 1/1] net: pegasus: remove dead coding

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Message-ID: <20160518062546.GB4388@p310>
Date:	Wed, 18 May 2016 09:25:46 +0300
From:	Petko Manolov <petkan@...-labs.com>
To:	Heinrich Schuchardt <xypron.glpk@....de>
Cc:	Petko Manolov <petkan@...leusys.com>, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] net: pegasus: remove dead coding

On 16-05-18 02:13:30, Heinrich Schuchardt wrote:
> (!count || count < 4) is always true.
> So let's remove the coding which is dead at least since 2005.

You may want to reconsider the above statement.  Just assume that 'count' is 
typically between 56 and 1514 bytes.


		Petko


> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
> ---
>  drivers/net/usb/pegasus.c | 53 -----------------------------------------------
>  1 file changed, 53 deletions(-)
> 
> diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
> index 36cd7f0..1903d2e 100644
> --- a/drivers/net/usb/pegasus.c
> +++ b/drivers/net/usb/pegasus.c
> @@ -470,61 +470,8 @@ static void read_bulk_callback(struct urb *urb)
>  		return;
>  	default:
>  		netif_dbg(pegasus, rx_err, net, "RX status %d\n", status);
> -		goto goon;
>  	}
>  
> -	if (!count || count < 4)
> -		goto goon;
> -
> -	rx_status = buf[count - 2];
> -	if (rx_status & 0x1e) {
> -		netif_dbg(pegasus, rx_err, net,
> -			  "RX packet error %x\n", rx_status);
> -		pegasus->stats.rx_errors++;
> -		if (rx_status & 0x06)	/* long or runt	*/
> -			pegasus->stats.rx_length_errors++;
> -		if (rx_status & 0x08)
> -			pegasus->stats.rx_crc_errors++;
> -		if (rx_status & 0x10)	/* extra bits	*/
> -			pegasus->stats.rx_frame_errors++;
> -		goto goon;
> -	}
> -	if (pegasus->chip == 0x8513) {
> -		pkt_len = le32_to_cpu(*(__le32 *)urb->transfer_buffer);
> -		pkt_len &= 0x0fff;
> -		pegasus->rx_skb->data += 2;
> -	} else {
> -		pkt_len = buf[count - 3] << 8;
> -		pkt_len += buf[count - 4];
> -		pkt_len &= 0xfff;
> -		pkt_len -= 4;
> -	}
> -
> -	/*
> -	 * If the packet is unreasonably long, quietly drop it rather than
> -	 * kernel panicing by calling skb_put.
> -	 */
> -	if (pkt_len > PEGASUS_MTU)
> -		goto goon;
> -
> -	/*
> -	 * at this point we are sure pegasus->rx_skb != NULL
> -	 * so we go ahead and pass up the packet.
> -	 */
> -	skb_put(pegasus->rx_skb, pkt_len);
> -	pegasus->rx_skb->protocol = eth_type_trans(pegasus->rx_skb, net);
> -	netif_rx(pegasus->rx_skb);
> -	pegasus->stats.rx_packets++;
> -	pegasus->stats.rx_bytes += pkt_len;
> -
> -	if (pegasus->flags & PEGASUS_UNPLUG)
> -		return;
> -
> -	pegasus->rx_skb = __netdev_alloc_skb_ip_align(pegasus->net, PEGASUS_MTU,
> -						      GFP_ATOMIC);
> -
> -	if (pegasus->rx_skb == NULL)
> -		goto tl_sched;
>  goon:
>  	usb_fill_bulk_urb(pegasus->rx_urb, pegasus->usb,
>  			  usb_rcvbulkpipe(pegasus->usb, 1),
> -- 
> 2.1.4
> 
>