Safe remove a network controller

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Hi folks,

When I developing Xen Windows Para-virtual Drivers, I use a pci driver to
enumerate block and network device. A NDIS miniport driver will service the
network device and a SCSI miniport driver will service the block device. Now
I have a problem when implement Safe Remove feature. I want to remove
network/block device safely like eject a USB device. When network/block
device is busy, system will pop up a warning dialog to notice the current
network/block device is busy and cannot remove now.

In my pci driver, I use IoRequestDeviceEject to the child PDO which I want
to safe remove. Block device works fine. When I use SDStress to take a heavy
load for the block device, windows will pop the warning dialog. But for
network device, even I use iperf to take a heavy load for the network
controller, PnP manager still send some IRP to notify my pci driver that the
network controller can safe remove and of course my NDIS miniport driver
remove the network device. Windows pops a message that the network controller
can now be safe removed.

So does any flag I missed in NDIS miniport driver to give a wrong message
that let NDIS port driver ignore to detect whether device is busy when my pci
driver call IoRequestDeviceEject? Or Does windows PnP manager has a policy
that network controller is not critical as block device and can safe remove
even it has heavy load? Please give me some tips to search or something I
need to read first.
--
Thanks
Wayne
.

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