linux-kernel - Re: [PATCH 01/15] kobject: Replace ALL occurrences of '/' with '!' instead of only the first one.

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Message-ID: <20080823021410.GB21403@suse.de>
Date:	Fri, 22 Aug 2008 19:14:10 -0700
From:	Greg KH <gregkh@...e.de>
To:	Ville Syrjälä <syrjala@....fi>,
	linux-kernel@...r.kernel.org, Ingo Oeser <ioe-lkml@...eria.de>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH 01/15] kobject: Replace ALL occurrences of '/' with '!'
	instead of only the first one.

On Fri, Aug 22, 2008 at 03:41:53PM +0300, Ville Syrjälä wrote:
> On Thu, Aug 21, 2008 at 10:32:49AM -0700, Greg Kroah-Hartman wrote:
> > From: Ingo Oeser <ioe-lkml@...eria.de>
> > 
> > A recent patch from Kay Sievers <kay.sievers@...y.org>
> > replaced the first occurrence of '/' with '!' as needed for block devices.
> > 
> > Now do some cheap defensive coding and replace all of them to avoid future
> > issues in this area.
> > 
> > Signed-off-by: Ingo Oeser <ioe-lkml@...eria.de>
> > Cc: Kay Sievers <kay.sievers@...y.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> > ---
> >  lib/kobject.c |    3 +--
> >  1 files changed, 1 insertions(+), 2 deletions(-)
> > 
> > diff --git a/lib/kobject.c b/lib/kobject.c
> > index bd732ff..fbf0ae2 100644
> > --- a/lib/kobject.c
> > +++ b/lib/kobject.c
> > @@ -223,8 +223,7 @@ static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
> >  		return -ENOMEM;
> >  
> >  	/* ewww... some of these buggers have '/' in the name ... */
> > -	s = strchr(kobj->name, '/');
> > -	if (s)
> > +	while ((s = strchr(kobj->name, '/')))
> >  		s[0] = '!';
> 
> That's somewhat inefficient. How about this?
> 
> s = kobj->name;
> while ((s = strchr(s, '/')))
> 	*s++ = '!';

Sure, but does it really matter?

thanks,

greg k-h
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