linux-kernel - Re: [Xen-devel] [PATCH 2/9] xen/pciback: Return proper error code from sscanf.

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Message-ID: <20111003161809.GD17108@phenom.oracle.com>
Date:	Mon, 3 Oct 2011 12:18:09 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	Dan Carpenter <error27@...il.com>, xen-devel@...ts.xensource.com,
	linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH 2/9] xen/pciback: Return proper error code
 from sscanf.

On Fri, Sep 30, 2011 at 08:45:26AM +0100, Jan Beulich wrote:
> >>> On 29.09.11 at 21:52, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> > . instead of just hardcoding it to be -EINVAL.
> > 
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > ---
> >  drivers/xen/xen-pciback/pci_stub.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/xen/xen-pciback/pci_stub.c 
> > b/drivers/xen/xen-pciback/pci_stub.c
> > index 32d6891..d985b65 100644
> > --- a/drivers/xen/xen-pciback/pci_stub.c
> > +++ b/drivers/xen/xen-pciback/pci_stub.c
> > @@ -868,7 +868,7 @@ static inline int str_to_slot(const char *buf, int 
> > *domain, int *bus,
> >  	if (err == 4)
> >  		return 0;
> >  	else if (err < 0)
> > -		return -EINVAL;
> > +		return err;
> >  
> >  	/* try again without domain */
> >  	*domain = 0;
> 
> This should then also be done for the final return from the function:
> 
> 	return err < 0 ? err : -EINVAL;
> 
> But: Where did you read that {v,}sscanf() would return -E... values in
> hypothetical error cases? The C standard says it would return EOF
> when reaching the end of the input string before doing the first
> conversion; lib/vsprintf.c doesn't do so, and also doesn't say it might
> return -E... codes. Bottom line is that I think the code is more correct
> the way it is without this change.

will drop the patch..
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