Re: [EXT] Re: [PATCH V1] ASoC: fsl_esai: replace fall-through with break

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

Hi Shengjiu,

On 4/8/19 9:54 PM, S.j. Wang wrote:
> Hi Gustavo
> 
>>
>>
>> On 4/8/19 4:28 AM, S.j. Wang wrote:
>>> case ESAI_HCKT_EXTAL and case ESAI_HCKR_EXTAL should be
>> independent of
>>> each other, so replace fall-through with break.
>>>
>> If this is correct, then you should use the following "Fixes" tag instead,
>> which is the one that introduced the bug:
>>
>> Fixes: 43d24e76b698 ("ASoC: fsl_esai: Add ESAI CPU DAI driver")
>>
>>> Fixes: 16bbeb2b43c3 ("ASoC: fsl_esai: Mark expected switch
>>> fall-through")
>>>
>>         ^^^^
>> because this didn't change any functionality.
> 
> Ok, this will be updated.
> 
>>
>>> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
>>> ---
>>>  sound/soc/fsl/fsl_esai.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c index
>>> c7410bbfd2af..bad0dfed6b68 100644
>>> --- a/sound/soc/fsl/fsl_esai.c
>>> +++ b/sound/soc/fsl/fsl_esai.c
>>> @@ -251,7 +251,7 @@ static int fsl_esai_set_dai_sysclk(struct
>> snd_soc_dai *dai, int clk_id,
>>>               break;
>>>       case ESAI_HCKT_EXTAL:
>>>               ecr |= ESAI_ECR_ETI;
>>
>> Also, you should use a simple assignment operator "=" instead of "|=" in
>> both cases.
> 
> The result is same for "=" and "|=", because there is "ecr = 0" in beginning of
> This function. 
> 

Following that same logic, then why not use "+=" instead?

The point is: is "|=" or any other assignment operator other than "=" necessary?
The answer in this case is: no, it is not.  So, go for the simple one and avoid
any unnecessary confusion.

Also, there is no need for versioning a patch for it's first revision.  If you
receive feedback on a patch and are asked to update it, then you do need to
version the patches that you re-send.

Thanks
--
Gustavo

>>
>>> -             /* fall through */
>>> +             break;
>>>       case ESAI_HCKR_EXTAL:
>>>               ecr |= esai_priv->synchronous ? ESAI_ECR_ETI : ESAI_ECR_ERI;
>>>               break;
>>>
>>
>> Thanks
>> --
>> Gustavo