Re: [linux-usb-devel] question on flushing buffers and spinning down disk
Oliver Neukum <[email protected]>
| Newsgroups | gmane.linux.scsi,gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
Am Montag 24 September 2007 schrieb Alan Stern: > On Mon, 24 Sep 2007, Oliver Neukum wrote: > > > > subsystem implements its own form of runtime PM support, then you'll be > > > able to use it properly. But until then, there isn't anything much you > > > can do. > > > > Well, we can't simply cut power. Buffers must be flushed and the disk > > spun down. The suspend() method of the storage driver will have to become > > complex. > > That's right, if the device is a real disk. If it's a flash memory > device then of course these issues don't arise. Unfortunately the > driver isn't able to tell one from the other; the user will have to > do that for us. So those devices which draw most power we don't suspend :-( Furthermore for many devices it will take real user intervention to determine what is in the enclosure. This isn't very good. I think we can do better. Regards Oliver - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html