Randy Dunlap [off-list ref] wrote:

quoted

+	  drivers from functioning because allowing manual configuration of
+	  hardware parameters is forbidden, lest a device be used to access the
+	  kernel by DMA.  This mostly applies to ISA devices.

	Is DMA from non-ISA devices OK, or did I miss seeing that patch?

The issue is where you can directly command a device to do DMA, possibly by
using the wrong driver.  Ask Alan Cox.

David