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DateWed, 13 Aug 2008 17:44:00 +0200
FromStefan Richter <>
SubjectRe: Power management for SCSI
Oliver Neukum wrote:
> Am Mittwoch 13 August 2008 16:59:23 schrieb Alan Stern:
[Quoting Oliver: true SCSI busses can be shared. So are we using the
correct approach?]
>> This is a good question. Most USB mass-storage devices do not act as a
>> true SCSI bus, but I believe there are a few non-standard ones that do
>> -- the USB device really contains a SCSI host and arbitrary SCSI
>
> OK, but does it make sense to have SCSI autosuspend? Or should autosuspend
> operate on the bus the _host_ is connected to (usb, pci, ...)?

In Alan's patch, SCSI calls scsi_host_template methods (if the LLD
provides ones) to suspend and resume a Scsi_Host. The LLD can use them
to work with the underlying infrastructure to determine what can be done
at that time. I.e. are there other protocols or other initiator-like
nodes sharing the link? If yes or if "maybe yes", the infrastructure
keeps the link up. If not, it can move it into a low-power state.
--
Stefan Richter
-=====-==--- =--- -==-=
http://arcgraph.de/sr/

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