[alsa-devel] [patch] ALSA: es1968: precedence bug in snd_es1968_tea575x_get_pins()

[Joe Perches]

On Tue, 2012-11-13 at 10:44 +0300, 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.
[]
> diff --git 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;

Cute.  smatch I presume?  Tools are useful.

Moving the close parentheses is a pretty common style too

	return  (val & STR_DATA ? TEA575X_DATA : 0) |
		(val & STR_MOST ? TEA575X_MOST : 0);