Re: [PATCH RESEND v1 2/3] ALSA: hda: cs35l41: Fix endian conversions

[Stefan Binding]

Hi Takashi,

On 05/06/2023 14:17, Takashi Iwai wrote:
> On Mon, 05 Jun 2023 14:50:54 +0200,
> Stefan Binding wrote:
> > Hi Takashi,
> >
> > On 05/06/2023 08:21, Takashi Iwai wrote:
> > > On Thu, 25 May 2023 15:59:54 +0200,
> > > Stefan Binding wrote:
> > > > @@ -379,10 +379,10 @@ static int cs35l41_save_calibration(struct cs35l41_hda *cs35l41)
> > > >      				/* Calibration can only be applied
> > > > whilst the DSP is not running */
> > > >    				ret = cs35l41_apply_calibration(cs35l41,
> > > > -								cpu_to_be32(cl->calAmbient),
> > > > -								cpu_to_be32(cl->calR),
> > > > -								cpu_to_be32(cl->calStatus),
> > > > -								cpu_to_be32(cl->calR + 1));
> > > > +								(__be32)cpu_to_be32(cl->calAmbient),
> > > > +								(__be32)cpu_to_be32(cl->calR),
> > > > +								(__be32)cpu_to_be32(cl->calStatus),
> > > > +								(__be32)cpu_to_be32(cl->calR + 1));
> > > Do we really need those cast?  Even if yes, it must be with __force
> > > prefix for the endian cast in general.
> > These casts were added because we found some warnings when we ran the
> > static analyzer sparse locally.
> > I think these warnings are very minor, and we can drop this patch if
> > you prefer?
> The warnings must be bogus, or maybe pointing to other things?
> The cpu_to_be32() macro itself must return a __be32 value, hence it
> makes no sense to add an extra cast .
>
> If the static analysis still shows such a warning, it should be fixed
> differently -- either fix the analyzer or fix the cpu_to_be32() macro
> itself.
>
> The changes of the argument types to __be32 are fine.  I'm arguing
> only about those unnecessary cast.

You are correct, I double checked and the cast is not needed. I'll push 
up a v2.

Thanks,

Stefan

> thanks,
>
> Takashi