clarifications needed on scsi_scan_target() and some more...

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Hello

I'm fairly new to the linux scsi landscape and had a couple of questions
on the subsystem api exported to LLDs:

1. How can a host rescan be done after initially calling scsi_scan_host
() ?

2. If scsi_scan_target() is used, can the a ptr to shost_gendev be used
without having to explicitly initialize any of its field other than what
is done by scsi_host_alloc()?

3. If a scsi_remove_device() is done asynchronously in between an abort,
is this acceptable?

4. How can a LLD explicitly set a scsi device state to offline or
online?

Would greatly appreciate any replies or pointers for more documentation.

Thanks in advance!
-Hari
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