linux-kernel - Re: [PATCH 5/14] drivers/net/sb1000.c: delete double assignment

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Date:	Tue, 26 Oct 2010 13:58:10 +0200
From:	walter harms <wharms@....de>
To:	Julia Lawall <julia@...u.dk>
CC:	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/14] drivers/net/sb1000.c: delete double assignment



Julia Lawall schrieb:
> From: Julia Lawall <julia@...u.dk>
> 
> The other code around these duplicated assignments initializes the 0 1 2
> and 3 elements of an array, so change the initialization of the
> rx_session_id array to do the same.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression i;
> @@
> 
> *i = ...;
>  i = ...;
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
> This changes the semantics and has not been tested.
> 
>  drivers/net/sb1000.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/sb1000.c b/drivers/net/sb1000.c
> index a9ae505..66c2f1a 100644
> --- a/drivers/net/sb1000.c
> +++ b/drivers/net/sb1000.c
> @@ -961,9 +961,9 @@ sb1000_open(struct net_device *dev)
>  	lp->rx_error_count = 0;
>  	lp->rx_error_dpc_count = 0;
>  	lp->rx_session_id[0] = 0x50;
> -	lp->rx_session_id[0] = 0x48;
> -	lp->rx_session_id[0] = 0x44;
> -	lp->rx_session_id[0] = 0x42;
> +	lp->rx_session_id[1] = 0x48;
> +	lp->rx_session_id[2] = 0x44;
> +	lp->rx_session_id[3] = 0x42;
>  	lp->rx_frame_id[0] = 0;
>  	lp->rx_frame_id[1] = 0;
>  	lp->rx_frame_id[2] = 0;
> 

/me is surprised that this did not cause more problems.
Is it needed at all ?

re,
 wh

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