Promise TX4 (PDC40718) hotplug support

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	Hello,

I have a Promise TX4 controller, and I have problems with hotplug. It seems
the controller does not recongnize the drive being hot-removed or hot-plugged.
I need either to reload the sata_promise module, or to do

	# echo 1 > /sys/block/sdN/device/delete

to remove the drive, and 

	# echo 0 0 0 > /sys/class/scs_host/hostN/scan

to scan for a new drive.

	Another box with nVidia CK08 (sata_nv) can recognize the removal and
insertion of the drive as hotplug events (so udev correctly remove and create
the /dev nodes, etc.), so I thought with Promise TX4 it would be the same,
especially as http://linux-ata.org/driver-status.html says about TX2/TX4
the following: "Full SATA control including hotplug and PM on all." 

	Is hotplug supported with this controller? Or could this be
a problem with the SATA backplane?

	The controller is (lspci):

06:00.0 Mass storage controller: Promise Technology, Inc. PDC40718 (SATA 300 TX4) (rev 02)

The userland is Fedora Core 6 and Fedora 7, x86_64 (intel CPU), and the
chassis and SATA backplane is Supermicro 743T-645
(http://www.supermicro.com/products/chassis/4U/743/SC743T-645.cfm).

	Thanks,

-Yenya

-- 
| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
| GPG: ID 1024/D3498839      Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
| http://www.fi.muni.cz/~kas/    Journal: http://www.fi.muni.cz/~kas/blog/ |
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