linux-kernel - Re: [PATCH 7/11] drivers/net/wireless/ath9k: Move a dereference below a NULL test

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Date:	Thu, 18 Dec 2008 18:11:15 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	"John W. Linville" <linville@...driver.com>
Cc:	lrodriguez@...eros.com, jmalinen@...eros.com,
	linux-wireless@...r.kernel.org, ath9k-devel@...ts.ath9k.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 7/11] drivers/net/wireless/ath9k: Move a dereference
 below a NULL test

On Thu, 18 Dec 2008, John W. Linville wrote:

> On Tue, Dec 16, 2008 at 04:14:28PM +0100, Julia Lawall wrote:
> > From: Julia Lawall <julia@...u.dk>
> > 
> > In each case, if the NULL test is necessary, then the dereference should be
> > moved below the NULL test.
> > 
> > The semantic patch that makes this change is as follows:
> > (http://www.emn.fr/x-info/coccinelle/)
> > 
> > // <smpl>
> > @@
> > type T;
> > expression E;
> > identifier i,fld;
> > statement S;
> > @@
> > 
> > - T i = E->fld;
> > + T i;
> >   ... when != E
> >       when != i
> >   if (E == NULL) S
> > + i = E->fld;
> > // </smpl>
> > 
> > Signed-off-by: Julia Lawall <julia@...u.dk>
> > 
> > ---
> >  drivers/net/wireless/ath9k/hw.c     |    3 ++-
> >  1 files changed, 2 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
> > index 98bc25c..7d1dac6 100644
> > --- a/drivers/net/wireless/ath9k/hw.c
> > +++ b/drivers/net/wireless/ath9k/hw.c
> > @@ -5581,11 +5581,12 @@ static inline bool ath9k_hw_run_init_cals(struct ath_hal *ah,
> >  	struct ath9k_channel ichan;
> >  	bool isCalDone;
> >  	struct hal_cal_list *currCal = ahp->ah_cal_list_curr;
> > -	const struct hal_percal_data *calData = currCal->calData;
> > +	const struct hal_percal_data *calData;
> >  	int i;
> >  
> >  	if (currCal == NULL)
> >  		return false;
> > +	calData = currCal->calData;
> >  
> >  	ichan.CalValid = 0;
> 
> This patch doesn't seem to apply.  I don't see this code anywhere.
> Perhaps this is against some older version?

I used the following version of linux-next, which indeed a bit out of 
date:

commit feaf3848a813a106f163013af6fcf6c4bfec92d9
Merge: a771132... 0e435ac...
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Wed Dec 3 16:45:56 2008 -0800


But I see the same code in the following version of linux-2.6

commit 1bda71282ded6a2e09a2db7c8884542fb46bfd4f
Merge: 7a62b17... 25a41b2...
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Tue Dec 16 09:49:10 2008 -0800

julia
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