* replace the pci_alloc_consistent calls with dma_alloc_coherent
  because we want to do the allocations at GFP_KERNEL priority and
  not GFP_ATOMIC because we request quite a bit of memory and the
  allocation fails quite frequently.

  It would be better to have a pci_alloc_consistent with an extra
  parameter (priority) but since we haven't, and the meye driver is
  supposed to work only on ix86 platforms we can safely do the
  change.

* fix the DMA engine stop request. The hard freezes encountered
  when using this driver and repeatedly opening/closing the device
  have been tracked down to this particular piece of code. The new
  version seems to work way better, I haven't had a single freeze
  since the change.

* fix the irq handler prototype (irqreturn_t changes).