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

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Message-ID: <21d2e747-f911-e9d4-2c55-e31c76c9d2bc@opensource.cirrus.com>
Date:   Mon, 5 Jun 2023 16:23:55 +0100
From:   Stefan Binding <sbinding@...nsource.cirrus.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>
Subject: Re: [PATCH RESEND v1 2/3] ALSA: hda: cs35l41: Fix endian conversions

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