> I'm working on the USB Mass Storage driver, which appears to be a SCSI
> host controller to the kernel. The question I have is this: how do I
> inform the higher SCSI layers that a device has appeared and disappeared?
The scsi layer doesn't really have a generic idea about this except for with
entire adapters vanishing (PCMCIA). It might be worth looking at how the
parallel port zip drive handles some of these issues.
> Mostly, I'm concerned with when devices appear. I can trace the code flow
> when a user does an "echo 'scsi add-single-device 0 0 0 0' >
> /proc/scsi/scsi, but is that safe to call at all times? Are there any
> restrictions on it's use?
Hard to say, its horrible code and about to get a partial overhaul. It should
be safe to do that from a kernel thread context providing you don't hold the
io request lock and are not doing it from a scsi function.
Its possible you want to swap your false persistence of controllers for a
controller per device and behave as PCMCIA does.
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