On Wed, 3 Mar 2010, Hugh Daschbach wrote: > > Can't we just protect the list? What is wanting to write to the list > > while shutdown is happening? > > Indeed, Alan suggested holding the kset spinlock while iterating the > list. Unfortunately, the device shutdown routines may sleep. At least > the SCSI sd_shutdown routine issues I/O to the device as part of > flushing device caches. I would guess other subsystems sleep as well. What I meant was that you should hold the spinlock while finding and unlinking the last device on the list. Clearly you shouldn't hold it while calling the device shutdown routine. > I'll try klist. That looks like a good mediator between traversal and > removal. Yes, it removes a lot of difficulties. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
