Re: [PATCH v6 2/4] Add support for SCT Write Same

[Shaun Tancheff]

On Thu, Aug 25, 2016 at 1:23 AM, Tom Yan <tom.ty89@xxxxxxxxx> wrote:
> You only fill the bytes that you want to to set explicitly:
>
> +       put_unaligned_le16(0x0002,  &sctpg[0]); /* SCT_ACT_WRITE_SAME */
> +       put_unaligned_le16(0x0101,  &sctpg[1]); /* WRITE PTRN FG */
> +       put_unaligned_le64(lba,     &sctpg[2]);
> +       put_unaligned_le64(num,     &sctpg[6]);
> +       put_unaligned_le32(0u,      &sctpg[10]);
>
> What I doubted is, if you don't memset (zero-fill) the buffer first,
> will other bytes have indeterministic value that causes random
> unexpected behavior?

No.
If there is random or unexpected behaviour the device is broken
and some other remedy, such as blacklisting, is required.

---
Shaun