iSCSI/shutdown advice needed

hi,
I'm trying to finish up the iSCSI initiator,
and need some advice. To shutdown the initiator, I
need to:
1- close down the CAM-peripherals, (ie da)
2- empty up all pending iSCSI transactions
3- close the tcp connection
2 & 3 I can handle, it's 1 that im stuck.
Q: how can I call the peripheral close function, or is there
some CAM command?
I tried
xpt_async(AC_LOST_DEVICE, isp->cam_path, NULL);
but this it far to drastic, and actually will cause panic
if the device is still mounted.

danny




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