linux-kernel - Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get

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Date:	Wed, 14 Nov 2012 22:24:18 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()

On Tuesday 13 November 2012 08:44:54 Dan Carpenter wrote:
> I don't think this works as intended.  '|' higher precedence than ?: so
> the bitwize OR "0 | (val & STR_MOST)" is a no-op.
>
> I have re-written it to be more clear.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> I don't have a way to test this.

Thanks for the patch. I tested it and it works.

The same way as without the patch...weird. DATA pin reading works because 
that's required for the chip detection. Stereo indication (MOST pin) works 
too.

>
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> index 50169bc..7266020 100644
> --- a/sound/pci/es1968.c
> +++ b/sound/pci/es1968.c
> @@ -2581,9 +2581,14 @@ static u8 snd_es1968_tea575x_get_pins(struct
> snd_tea575x *tea) struct es1968 *chip = tea->private_data;
>  	unsigned long io = chip->io_port + GPIO_DATA;
>  	u16 val = inw(io);
> -
> -	return  (val & STR_DATA) ? TEA575X_DATA : 0 |
> -		(val & STR_MOST) ? TEA575X_MOST : 0;
> +	u8 ret;
> +
> +	ret = 0;
> +	if (val & STR_DATA)
> +		ret |= TEA575X_DATA;
> +	if (val & STR_MOST)
> +		ret |= TEA575X_MOST;
> +	return ret;
>  }
>
>  static void snd_es1968_tea575x_set_direction(struct snd_tea575x *tea, bool
> output) --
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-- 
Ondrej Zary
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