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

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Date:	Wed, 7 Nov 2007 11:04:41 -0800
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Roel Kluin" <12o3l@...cali.nl>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix incorrect test in trident_ac97_set(); sound/oss/trident.c

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...

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