Yes, because it touches an actual ATA drive setting, while D_SENSE is merely a "software setting" stored in dev->flags to make the kernel response differently when build sense data.
On 26 July 2016 at 02:30, Tejun Heo <t...@kernel.org> wrote: > On Fri, Jul 22, 2016 at 05:50:18AM +0800, Tom Yan wrote: >> As I've mentioned in the comment/message, there is no ATA command >> needed to be sent to the device, since it only toggles a bit in >> dev->flags. See that there is no ata_taskfile constructed in >> ata_mselect_control(). > > But ata_mselect_caching() contructs a tf? > > -- > tejun
