linux-kernel - Re: [PATCH 26/45] kstrtox: convert drivers/isdn/

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Date:	Mon, 6 Dec 2010 22:10:08 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Tilman Schmidt <t.schmidt@...enixsoftware.de>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 26/45] kstrtox: convert drivers/isdn/

On Mon, Dec 06, 2010 at 01:10:45AM +0100, Tilman Schmidt wrote:
> I like the patch, but why not go all the way?
> 
> Am 05.12.2010 18:49 schrieb Alexey Dobriyan:
> > @@ -566,10 +566,10 @@ void gigaset_handle_modem_response(struct cardstate *cs)
> >  		case RT_ZCAU:
> >  			event->parameter = -1;
> >  			if (curarg + 1 < params) {
> > -				unsigned long type, value;
> > +				u8 type, value;
> >  
> > -				i = strict_strtoul(argv[curarg++], 16, &type);
> > -				j = strict_strtoul(argv[curarg++], 16, &value);
> > +				i = kstrtou8(argv[curarg++], 16, &type);
> > +				j = kstrtou8(argv[curarg++], 16, &value);
> >  
> >  				if (i == 0 && type < 256 &&
> >  				    j == 0 && value < 256)
> 
> Once type and value are u8, the checks for < 256 are unnecessary.

OK.

> > @@ -583,7 +583,7 @@ void gigaset_handle_modem_response(struct cardstate *cs)
> >  				unsigned long res;
> >  				int rc;
> >  
> > -				rc = strict_strtoul(argv[curarg++], 10, &res);
> > +				rc = kstrtoul(argv[curarg++], 10, &res);
> >  				if (rc == 0)
> >  					event->parameter = res;
> >  			}
> 
> The new kstrtoul() promises not to touch the result field in the event
> of a conversion error, so &event->parameter can be passed directly to
> it, getting rid of the variables rc and res and the if statement.

What should be done in case of error?
Compiler will warn if kstrto*() result is unused:

	kstrtoul(argv[curarg++], 10, &event->parameter);
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