linux-kernel - Re: sound/pci/hda/intel

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Message-ID: <20060831222920.GF12847@elf.ucw.cz>
Date:	Fri, 1 Sep 2006 00:29:20 +0200
From:	Pavel Machek <pavel@....cz>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>, perex@...e.cz,
	alsa-devel@...a-project.org, pshou@...ltek.com.tw
Subject: Re: sound/pci/hda/intel_hda: small cleanups

Hi!

> > > > @@ -271,8 +272,8 @@ struct azx_dev {
> > > >  	/* for sanity check of position buffer */
> > > >  	unsigned int period_intr;
> > > >  
> > > > -	unsigned int opened: 1;
> > > > -	unsigned int running: 1;
> > > > +	unsigned int opened :1;
> > > > +	unsigned int running :1;
> > > >  };
> > > >  
> > > >  /* CORB/RIRB */
> > > > @@ -330,8 +331,8 @@ struct azx {
> > > >  
> > > >  	/* flags */
> > > >  	int position_fix;
> > > > -	unsigned int initialized: 1;
> > > > -	unsigned int single_cmd: 1;
> > > > +	unsigned int initialized :1;
> > > > +	unsigned int single_cmd :1;
> > > >  };
> > > 
> > > Any official standard reference for bit-field expressions?
> > 
> > Well, logically : belongs to the 1, and include/linux understands it
> > like that...
> 
> OK, "xxx :1;" looks major, too :)
> 
> > > >  /* driver types */
> > > > @@ -642,14 +643,14 @@ static int azx_reset(struct azx *chip)
> > > >  	azx_writeb(chip, GCTL, azx_readb(chip, GCTL) | ICH6_GCTL_RESET);
> > > >  
> > > >  	count = 50;
> > > > -	while (! azx_readb(chip, GCTL) && --count)
> > > > +	while (!azx_readb(chip, GCTL) && --count)
> > > >  		msleep(1);
> > > 
> > > Hm, it looks rather like a personal preference.
> > > IMHO, it's harder to read without space...
> > 
> > Well, core parts (sched.c?) use it without the space, and I'd say (!
> > expression) is unusual in kernel, but no, could not find it codified.
> 
> I don't mind much to change it now, but hopefully people won't be too
> strict about this rule...

Thanks.

> > > I'll fix the volatile things separately.
> 
> The access is really over RAM, not MMIO.  So it should be OK to access
> in that way.  But volatile seems superfluous.  I'll get rid of it.

Sorry, I understood the code well enough to sense something is wrong,
but not enough to know how to fix it.

> Also, msleep() in the removal should be synchronize_irq().

Good.

> I'll fix these changes and commit with your space fixes to ALSA tree.

Thanks!
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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