On Wed, Aug 24, 2016 at 1:10 AM, Tom Yan [off-list ref] wrote:

Btw, I wonder if you need to memset your buffer with 0 first, like
what is done in ata_scsi_rbuf_get.

It is not necessary as the defined buffer is completely filled out here.

Are you thinking as a sort of future proofing?
Ex: In the unlikely event that the SCT Write Same command
descriptor is expanded in a future ACS?

It is more likely to see the command deprecated and replaced with a
new SCT feature.

Regardless of how unlikely I would consider a memset here to clear
the remainder of the payload.