On Fri, 26 Jun 2009, Oliver Neukum wrote: > Hi Alan, > > are pm counters allowed to go negative? Interface usage counters are; usbcore doesn't care what values they hold -- drivers can do whatever they want. The core only checks for > 0 vs. <= 0. Device usage counters are allowed to go negative but there's a WARN_ON if they do. In Rafael's new runtime PM framework, things are different. The final version hasn't been decided on yet. However since the counter values will persist beyond driver unbinding, the increments and decrements need to remain balanced. Thus the values should never become negative. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
