On Mon, 2007-01-22 at 17:47 +0100, Stefan Richter wrote: > As I wrote before, deal with it like with hot-unplug. A kernel driver > cannot prevent the user from pulling a cable. This is exactly the correct advice. The hotplug model requires that you own a reference on the resources you want to access. When you're done, you release the reference and the last person to drop the reference causes the object to be freed. For scsi_hosts, every open device keeps a reference on the host, so the way do destroy one is to do a scsi_remove_host() which releases your interest in the host object, but keeps it around long enough to tidy up after it. For physical drivers, your queuecommand() routine may still be required to handle the odd stray command after the removal notice has been issued, however, by and large SCSI begins rejecting I/O to the devices higher up. When the last device is closed, it will release the last reference to the host and trigger final cleanup. James - 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
