(I post this again because this isn't attached to the mail thread)

UFSHCI specifies Data Byte Count (DBC) like this:
A '0' based value that indicates the length, in bytes, of the data
block. A maximum of length of 256KB may exist for any entry. Bits 1:0 of this
field shall be 11b to indicate Dword granularity.
A value of '3' indicates 4 bytes, '7' indicates 8 bytes, etc.

That means the size value should be aligned with 4. And as I know it's 18.
Yes, its buffer is enough but if a host doesn't access memory with four-byte
alignment, it could cause problems.

Thanks.
Kiwoong Kim