On Sat, 17 Mar 2012, Tejun Heo wrote: > Hello, Alan. > > On Sat, Mar 17, 2012 at 7:10 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > >> Why not just lock out freezing across that issue / flush section? > > > > Currently there is no way to lock out freezing. > > lock_system_sleep()? That would work, _provided_ disk_clear_events() is never called in a freezable thread. But if that never happens then the deadlock Oliver was worried about will never happen either. > >�Besides, it may already have started. > > What? I don't know where disk_clear_events() gets called. For example, is it called by a user task when opening or closing a file or device? If so then it is freezable, which means that if a system sleep transition has already started, the routine can't afford to wait until the sleep is over. 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
