Am Mittwoch, 31. Januar 2007 17:11 schrieb Alan Stern:
> This looks more complicated than it should be. In particular, the
> addition of a new "idle" timer should not be needed.
>
> We already have an autosuspend timer: the one embedded in the autosuspend
> delayed_work struct inside struct usb_device. What you really want to do
> is make the delay configurable per-device instead of relying on a fixed
> constant USB_AUTOSUSPEND_DELAY. Doing things that way would remove a
> tremendous amount of complexity from your patch.
It would also introduce a layering violation.
Furthermore that work should be queued only if pm_usage_cnt==0,
which cannot be allowed if the device isn't idle.
> If the user could put usbcore.autosuspend_delay=60 on the boot command
> line, then it would be possible to prevent some devices from being
> autosuspended.
Just startup with autosuspend off.
> P.S.: Nowadays we're supposed to use DEFINE_SPINLOCK().
Modernist ;-)
Regards
Oliver
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