linux-kernel - Re: [PATCH] staging: rtl8192u: bool tests don't need comparisons

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Message-ID: <20150623141937.GA5328@goodgumbo.baconseed.org>
Date:	Tue, 23 Jun 2015 16:19:37 +0200
From:	Luis de Bethencourt <luis@...ethencourt.com>
To:	Frans Klaver <fransklaver@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Antoine Schweitzer-Chaput <antoine@...weitzer-chaput.fr>,
	Cristina Opriceana <cristina.opriceana@...il.com>,
	Aya Mahfouz <mahfouz.saif.elyazal@...il.com>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Koray Gulcu <koray.gulcu@....edu.tr>,
	Greg Donald <gdonald@...il.com>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Ebru Akagunduz <ebru.akagunduz@...il.com>,
	Karthik Nayak <karthik.188@...il.com>,
	devel@...verdev.osuosl.org
Subject: Re: [PATCH] staging: rtl8192u: bool tests don't need comparisons

On Tue, Jun 23, 2015 at 03:59:41PM +0200, Frans Klaver wrote:
> On Tue, Jun 23, 2015 at 3:59 PM, Luis de Bethencourt
> <luis@...ethencourt.com> wrote:
> > On Tue, Jun 23, 2015 at 03:37:20PM +0200, Frans Klaver wrote:
> >> On Tue, Jun 23, 2015 at 3:21 PM, Luis de Bethencourt
> >> <luis@...ethencourt.com> wrote:
> >>
> >> >> >         if (dm_digtable.dig_algorithm_switch) {
> >> >> > @@ -3062,7 +3062,8 @@ static void dm_dynamic_txpower(struct net_device *dev)
> >> >> >                         priv->bDynamicTxLowPower = false;
> >> >> >                 } else {
> >> >> >                         /* high power state check */
> >> >> > -                       if (priv->undecorated_smoothed_pwdb < txlowpower_threshold && priv->bDynamicTxHighPower == true)
> >> >> > +                       if (priv->undecorated_smoothed_pwdb <
> >> >> > +                           txlowpower_threshold && priv->bDynamicTxHighPower)
> >> >> >                                 priv->bDynamicTxHighPower = false;
> >> >>
> >> >> Oh, this has a misleading air hanging over it. It focuses the eyes on
> >> >> "txlowpower_threshold && priv->bDynamicTxHighPower", while that
> >> >> probably isn't the intent.
> >> >>
> >> >> Frans
> >> >
> >> > I agree, and wasn't sure what the best way to deal with was.
> >> >
> >> > The following doesn't mislead but goes above 80 characters.
> >> >                         if (priv->undecorated_smoothed_pwdb < txlowpower_threshold &&
> >> >                             priv->bDynamicTxHighPower == true)
> >> >
> >> > It is better than the original but it doesn't completely fix it.
> >> >
> >> > If this is a better compromise I can update the patch.
> >>
> >> If we keep people's internal parsers working properly, I think having
> >> a line of three characters too long is a fair compromise. Besides
> >> that, there are a lot more lines of code in that file that need to be
> >> brought back to under 80 characters.
> >>
> >> If you really care about that line length, precede with a patch (or
> >> two) that changes those insanely long (local!) variable names, so that
> >> you can break up the line right away.
> >>
> >> Have fun,
> >> Frans
> >
> > Very true. There are a *lot* of massively long lines.
> >
> > This has been a learning experience. I wasn't sure how strict the rules for
> > submissions were.
> 
> Well, as far as I know "Don't break internal parsers" wins over
> "Checkpatch complains". However, checkpatch usually does have a nose
> for smelly code (as does sparse, btw), so it pays to look around a bit
> if it complains. In the end the maintainer decides whether a patch
> passes the criteria.
> 

Even if analyzers miss things and give false positives, they are interesting
tools to find interesting code to read and maybe double-check things before
submitting.

> > There are other things besides line lengths that I want to fix in
> > rtl8192u. Related to that, I just sent a 3rd version which includes fixes for
> > these bool comparisons for the rest of the files in drivers/staging/rtl8192u/
> >
> > Thanks so much for taking the time to review. Appreciated.
> 
> No problem. Was waiting for a yocto build to finish anyway.
> 
> Frans

Have fun with yocto!
Luis
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