Re: [PATCH RFC V2 3/3] scsi_mq: enable runtime PM

Bart Van Assche
2018-07-17T15:34:35Z

On Tue, 2018-07-17 at 23:30 +0800, Ming Lei wrote:
> On Tue, Jul 17, 2018 at 03:24:11PM +0200, Christoph Hellwig wrote:
> > On Fri, Jul 13, 2018 at 04:06:02PM +0800, Ming Lei wrote:
> > > Usually SCSI supports runtime PM, so pass BLK_MQ_=
F_SUPPORT_RPM to blk-mq
> > > core for enabling block runtime PM.
> >=20
> > I still think enabling this unconditionally for any SCSI device=
was
> > a mistake, and it is even more so for blk-mq.
> >=20
> > Please only opt in for ufs, ATA first, adding others if wanted =
by
> > maintainers.
>=20
> No, this way will cause regression because runtime PM works for
> all sd/sr device actually, and it isn't related with scsi host.

For which SCSI devices other than ufs and ATA do we need PM support?

Bart.