Hot-plugging Support in kernel 2.6.8 ??

Hi list,

I'm new to Linux / SCSI so please help me out on this one.

I'm investigating the "Hot Plugging" support in SCSI subsystem of linux
kernel 2.6.8. I am working at the LLD level. I went through the "Hot Plug
Initialisation Model" in Doumentation/scsi/scsi_mid_low_api.txt (which is
not up to date) and code and concluded that :

1) In case a new HBA is Hot plugged, the LLD needs to call
scsi_host_alloc(), scsi_add_host(), scsi_scan_host().
2) In case an existing HBA is Hot UN-plugged, the LLD needs to call
scsi_remove_host(), scsi_host_put().
3) In case a new SCSi device is hot plugged / Un plugged to an existing HBA,
LLD needs to call scsi_add_device() / scsi_remove_device() respectively.

But what is not clear to me is that how exacly I (as an LLD writer) come to
know that a new device has been detected? So where do I put these calls? Are
there any specific functions in LLD that are called when a new device / HBA
is added?? The documentation says this:

"Typically a driver will respond to a sysfs probe() callback that indicates
an HBA has been detected".

What does this mean? Simply put, I have my own function that I want to be
called when ever a new SCSI device is detected on an existing HBA. How do I
do that? Or how can I achieve this functionality?

Any pointers are welcome.


Thanks & regards,

Rajat Jain
HCL Technologies,
A-11, Sector 16, Noida-201301.
Ph: +91-120-2510701/702/813 Extn.3019
rajatj@noida.hcltech.com
http://www.hcltech.com/
"...one of the main causes of the fall of the Roman Empire was that,
lacking zero, they had no way to indicate successful termination of their C
programs."
Robert Firth

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