Re: [alsa-devel] [PATCH] ALSA: hda/ca0132: Limit values for chip addresses to 32-bit

[Takashi Iwai]

On Thu, 16 Mar 2017 21:52:23 +0100,
Matthias Kaehlcke wrote:
> 
> With the previous unsigned long value clang generates warnings like
> this:
> 
> sound/pci/hda/patch_ca0132.c:860:37: error: implicit conversion from
>   'unsigned long' to 'u32' (aka 'unsigned int') changes value from
>   18446744073709551615 to 4294967295 [-Werror,-Wconstant-conversion]
>         spec->curr_chip_addx = (res < 0) ? ~0UL : chip_addx;
>                              ~             ^~~~
> 
> Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>

Thanks for the patch.  The changes look mostly OK, but...

> ---
>  sound/pci/hda/patch_ca0132.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/pci/hda/patch_ca0132.c b/sound/pci/hda/patch_ca0132.c
> index 11b9b2f17a2e..7175e2b46fc4 100644
> --- a/sound/pci/hda/patch_ca0132.c
> +++ b/sound/pci/hda/patch_ca0132.c
> @@ -857,7 +857,7 @@ static int chipio_write_address(struct hda_codec *codec,
>  				  chip_addx >> 16);
>  	}
>  
> -	spec->curr_chip_addx = (res < 0) ? ~0UL : chip_addx;
> +	spec->curr_chip_addx = (res < 0) ? (u32)~0U : chip_addx;

... I guess the cast to u32 is superfluous here?  That is, just
replace UL to U should work, I suppose.  (Ditto for all other places.)


Takashi