linux-kernel - Re: [PATCH] fix incorrect test in trident_ac97

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Date:	Thu, 8 Nov 2007 08:06:31 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Ray Lee <ray-lk@...rabbit.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roel Kluin <12o3l@...cali.nl>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix incorrect test in trident_ac97_set(); sound/oss/trident.c

On Wed, Nov 07, 2007 at 11:04:41AM -0800, Ray Lee wrote:

> On Nov 7, 2007 10:50 AM, Roel Kluin <12o3l@...cali.nl> wrote:

> > If count reaches zero, the loop ends, but the postfix decrement
> > still subtracts: testing for 'count == 0' will not work.
> >
> > Signed-off-by: Roel Kluin <12o3l@...cali.nl>
> > ---
> > diff --git a/sound/oss/trident.c b/sound/oss/trident.c
> > index 96adc47..6959ee1 100644
> > --- a/sound/oss/trident.c
> > +++ b/sound/oss/trident.c
> > @@ -2935,7 +2935,7 @@ trident_ac97_set(struct ac97_codec *codec, u8 reg, u16 val)
> >         do {
> >                 if ((inw(TRID_REG(card, address)) & busy) == 0)
> >                         break;
> > -       } while (count--);
> > +       } while (--count);
> >
> >         data |= (mask | (reg & AC97_REG_ADDR));
> >
> > @@ -2996,7 +2996,7 @@ trident_ac97_get(struct ac97_codec *codec, u8 reg)
> >                 data = inl(TRID_REG(card, address));
> >                 if ((data & busy) == 0)
> >                         break;
> > -       } while (count--);
> > +       } while (--count);
> >
> >         spin_unlock_irqrestore(&card->lock, flags);
> >
> >         if (count == 0) {
> >
> 
> Thanks, much better. In the future, please also CC: the appropriate
> maintainers, or Andrew Morton if you're at a loss...

Indeed.

> Reviewed-by: Ray Lee <ray-lk@...rabbit.org>

Acked-by: Muli Ben-Yehuda <muli@...ibm.com>

Andrew, can you please push to Linus?

Thanks,
Muli
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