Messages in this thread | | | Date | Thu, 31 Mar 2005 14:08:36 -0500 | From | Dmitry Torokhov <> | Subject | Re: klists and struct device semaphores |
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On Thu, 31 Mar 2005 10:26:36 -0800 (PST), Patrick Mochel <mochel@digitalimplant.org> wrote: > I don't understand what you mean. Even if a device is suspended, be it > automatically after some amount of inactivity or as directed explicitly by > a user, we want to be able to open the device and have it work. > > Conversely, we only want to automatically suspend the device, or allow the > device to be explicitly put to sleep, if the device is not being used.
Well, the disagreement in definition of "being used". Quite often you have a device "open" for extended period of time (inactive ext2 partition is mounted on a disk) but device is not really active. You could power it down and only wake up when there is a read or write request.
It looks like "open" and "close" are terms better suited for class devices while power management is applied to the "real" devices.
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