On 7/27/05, John W. Linville [off-list ref] wrote:

Some PCI devices (e.g. 3c905B, 3c556B) lose all configuration
(including BARs) when transitioning from D3hot->D0.  This leaves such
a device in an inaccessible state.  The patch below causes the BARs
to be restored when enabling such a device, so that its driver will
be able to access it.

Is it just me or will this stuff help the kexec guys as well?  They seem 
to have lots of problems because drivers put the device into D3 before the 
reload of the new kernel.  I think this might help.

Jesse