On Fri, Mar 02, 2007 at 02:19:11PM -0500, Robert P. J. Day wrote: > On Fri, 2 Mar 2007, Greg KH wrote: > > > On Fri, Mar 02, 2007 at 10:27:46AM -0500, Robert P. J. Day wrote: > > > > more later after i do more reading. > > > > What specifically are you trying to figure out here? > > there's nothing specific so much as i just want a clear idea of the > *big* picture. all of the documentation i read is perfectly adequate > in terms of explaining the low-level details, but is maddeningly vague > in discussing how it all hangs together at the *highest* level. > > one thing i'm still unclear on is how, if you can't traverse the sysfs > tree from the top down, how does a power down cleanly start to shut > stuff off from the leaves and work its way back up? how does the > power down procedure *get* to the leaves of the tree in the first > place? We walk the list of all devices in the system. See the call to device_pm_add() which is called in device_add(). This adds the device to a list that is then later walked in the function device_suspend(). So don't get mired down in the kset/subsystem mess, it's all a lot simpler once you get above that. Not to say that the kset/subsystem stuff shouldn't be cleaned up... thanks, greg k-h -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
