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

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Date:   Fri, 31 Mar 2017 17:52:58 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Sven Hahne <hahne@...tkunst.eu>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        alsa-devel@...a-project.org,
        Grant Grundler <grundler@...omium.org>,
        linux-kernel@...r.kernel.org, Greg Hackmann <ghackmann@...gle.com>,
        Michael Davidson <md@...gle.com>
Subject: Re: [alsa-devel] [PATCH] ALSA: hda/ca0132: Limit values for chip
 addresses to 32-bit

Sorry for the delayed reply,

El Mon, Mar 20, 2017 at 10:33:43AM +0100 Takashi Iwai ha dit:

> 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@...omium.org>
> 
> 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.)

You are right, the cast is not needed. I'll send an updated version.

Cheers

Matthias