From: Dave Olien <dmo@osdl.org>

this patch fixes a bug that appeared only on Alpha hardware with
DAC960 controllers.  The Command->PciDevice structure member was
never initialized.  This was passed to the pci scatter/gather functions.
This didn't cause a problem for x86 platforms because the scatter/gather
funtions never really used that information.  Alpha platforms do use
that pointer.

The Command->PciDevice field was also redundant with the Controller->PCIDevice
field, which IS initialized properly.  So, eliminating the redundant
structure member and substituting the Controller's member fixes the bug.