On Thu, Sep 13, 2007 at 10:19:48AM -0400, Alan Stern wrote: > On Thu, 13 Sep 2007, Greg KH wrote: > > > Ok, after conferring with Oliver this morning, I think the best solution > > here is to both revert the usb-storage suspend patch as it has some > > basic problems that can cause data loss, _and_ add the change to the > > kernel that by default disables autosuspend on all USB devices except > > hubs. > > Are you referring to the disk spin-down issue? As far as I know, > that's the only troublesome aspect of usb-storage autosuspend (apart > from the fact that so many devices don't seem to support it very well, > if at all). > > Solving the spin-down problem will require coordination with the SCSI > developers. Basically, the SCSI core has to notify the HBA driver > whenever the bus has been idle sufficiently long and all its devices > are ready to be suspended. In particular, all disk heads should be > parked and drives spun down, if they need to be. I am not sure. I will defer to Oliver for the knowledge of the details, it was early in the morning and I can't remember them all exactly :) (although it might be a few days for him to respond, he's here at a conference without a laptop, so his lag time might be a bit longer than normal...) thanks, greg k-h - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
