netdev - Re: [PATCH] WAN: bit and/or confusion

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Message-Id: <20090814163644.0cc8974f.akpm@linux-foundation.org>
Date:	Fri, 14 Aug 2009 16:36:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	romieu@...zoreil.com, netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] WAN: bit and/or confusion

On Fri, 14 Aug 2009 14:51:46 +0200
Roel Kluin <roel.kluin@...il.com> wrote:

> Fix the tests that check whether Frame* bits are not set
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> // vi drivers/net/wan/dscc4.c +307
> #define FrameVfr	0x80
> #define FrameRdo        0x40
> #define FrameCrc	0x20
> #define FrameRab	0x10
> 
> diff --git a/drivers/net/wan/dscc4.c b/drivers/net/wan/dscc4.c
> index 8face5d..dd3c64a 100644
> --- a/drivers/net/wan/dscc4.c
> +++ b/drivers/net/wan/dscc4.c
> @@ -663,9 +663,9 @@ static inline void dscc4_rx_skb(struct dscc4_dev_priv *dpriv,
>  	} else {
>  		if (skb->data[pkt_len] & FrameRdo)
>  			dev->stats.rx_fifo_errors++;
> -		else if (!(skb->data[pkt_len] | ~FrameCrc))
> +		else if (!(skb->data[pkt_len] & ~FrameCrc))
>  			dev->stats.rx_crc_errors++;

that's

	if (!(x & 0xffffffdf))

which seems peculiar.  Should it have been

	else if (skb->data[pkt_len] & FrameCrc)

or

	else if (!(skb->data[pkt_len] & FrameCrc))


> -		else if (!(skb->data[pkt_len] | ~(FrameVfr | FrameRab)))
> +		else if (!(skb->data[pkt_len] & ~(FrameVfr | FrameRab)))
>  			dev->stats.rx_length_errors++;
>  		else
>  			dev->stats.rx_errors++;


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