netdev - Re: [PATCH 10/14] drivers/isdn: delete double assignment

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Date:	Tue, 26 Oct 2010 14:01:12 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	walter harms <wharms@....de>
Cc:	Karsten Keil <isdn@...ux-pingi.de>,
	kernel-janitors@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/14] drivers/isdn: delete double assignment

On Tue, 26 Oct 2010, walter harms wrote:

> 
> 
> Julia Lawall schrieb:
> > From: Julia Lawall <julia@...u.dk>
> > 
> > Delete successive assignments to the same location.  In the first case, the
> > hscx array has two elements, so change the assignment to initialize the
> > second one.  In the second case, the two assignments are simply identical.
> > 
> > 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>
> > 
> > ---
> > In the first case, the patch changes the semantics and has not been tested.
> > 
> >  drivers/isdn/hardware/mISDN/mISDNinfineon.c |    2 +-
> >  drivers/isdn/hisax/l3_1tr6.c                |    2 --
> >  2 files changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/drivers/isdn/hardware/mISDN/mISDNinfineon.c b/drivers/isdn/hardware/mISDN/mISDNinfineon.c
> > index af25e1f..e90db88 100644
> > --- a/drivers/isdn/hardware/mISDN/mISDNinfineon.c
> > +++ b/drivers/isdn/hardware/mISDN/mISDNinfineon.c
> > @@ -563,7 +563,7 @@ reset_inf(struct inf_hw *hw)
> >  		mdelay(10);
> >  		hw->ipac.isac.adf2 = 0x87;
> >  		hw->ipac.hscx[0].slot = 0x1f;
> > -		hw->ipac.hscx[0].slot = 0x23;
> > +		hw->ipac.hscx[1].slot = 0x23;
> >  		break;
> >  	case INF_GAZEL_R753:
> >  		val = inl((u32)hw->cfg.start + GAZEL_CNTRL);
> > diff --git a/drivers/isdn/hisax/l3_1tr6.c b/drivers/isdn/hisax/l3_1tr6.c
> > index b0554f8..a5c76fc 100644
> > --- a/drivers/isdn/hisax/l3_1tr6.c
> > +++ b/drivers/isdn/hisax/l3_1tr6.c
> > @@ -164,8 +164,6 @@ l3_1tr6_setup(struct l3_process *pc, u_char pr, void *arg)
> >  	char tmp[80];
> >  	struct sk_buff *skb = arg;
> >  
> > -	p = skb->data;
> > -
> >  	/* Channel Identification */
> >  	p = skb->data;
> >  	if ((p = findie(p, skb->len, WE0_chanID, 0))) {
> > 
> 
> 
> perhaps you can move the next assignment out of if also ?
> 
> p = findie(skb->data, skb->len, WE0_chanID, 0);
> if (p) { ....

OK.

julia
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