Re: [PATCH v35 3/4] scsi: ufs: Prepare HPB read for cached sub-region

[Bart Van Assche]

On 6/3/21 6:11 PM, Daejun Park wrote:

>>> +/*
>>> + * This function will set up HPB read command using host-side L2P map data.
>>> + * In HPB v1.0, maximum size of HPB read command is 4KB.
>>> + */
>>> +void ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
>>> +{
>> [ ... ]
>>> +
>>> +        ufshpb_set_hpb_read_to_upiu(hpb, lrbp, lpn, ppn, transfer_len);
>>
>> 'transfer_len' has type int and is truncated to type 'u8' when passed as
>> an argument to ufshpb_set_hpb_read_to_upiu(). Please handle transfer_len
>> values >= 256 properly.
> 
> Before entering the function, ufshpb_is_supported_chunk() checks whether
> transfer_len <= hpb->pre_req_max_tr_len which is set to
> HPB_MULTI_CHUNK_HIGH (128) on initalization.

How about adding a WARN_ON_ONCE() in ufshpb_prep() that verifies that
transfer_len is <= HPB_MULTI_CHUNK_HIGH?

Thanks,

Bart.