Re: [PATCH v2] mtd: rawnand: mark expected switch fall-throughs

Gustavo A. R. Silva
2019-04-11T18:30:49Z

Hi Miquel,

On 2/5/19 6:55 AM, Miquel Raynal wrote:
[..]
>> @@ -3280,12 +3280,14 @@ static void onenand_check_features(struct mtd_info *mtd)
>> if ((this->version_id & 0xf) == 0xe)
>> this->options |= ONENAND_HAS_NOP_1;
>> }
>> + /* fall through */
>>
>> case ONENAND_DEVICE_DENSITY_2Gb:
>> /* 2Gb DDP does not have 2 plane */
>> if (!ONENAND_IS_DDP(this))
>> this->options |= ONENAND_HAS_2PLANE;
>> this->options |= ONENAND_HAS_UNLOCK_ALL;
>> + /* fall through */
>
> This looks strange.
>
> In ONENAND_DEVICE_DENSITY_2Gb:
> ONENAND_HAS_UNLOCK_ALL is set unconditionally.
>
> But then, under ONENAND_DEVICE_DENSITY_1Gb, the same option is set only
> if process is evaluated to true.
>
> Same problem with ONENAND_HAS_2PLANE:
> - it is set in ONENAND_DEVICE_DENSITY_4Gb only if ONENAND_IS_DDP()
> - it is unset in ONENAND_DEVICE_DENSITY_2Gb only if !ONENAND_IS_DDP()
>
> Maybe this portion should be reworked because I am unsure if this is a
> missing fall through or a bug.
>

I wonder if you had the chance to take a look into this piece of code.

Thanks
--
Gustavo