> Where does the device come from? What device is it?
At the higher level someone passed us a device and some mappings and
function methods and said "this is an IDE controller"
> Is that known already?
The core code has no idea or interest in where it came from.
> But at least on x86-64 the device is likely DMA capable. At least
> PCMCIA usually is. Near all devices are DMA capable, except perhaps
PCMCIA usally isn't.
> So if I return NULL then either a really DMA capable device will
> not work. Or you got a real oddball device that you shouldn't have gotten
> in the first place.
What about other platforms ? I don't want libata to have
#ifdef CONFIG_X86_64
/* this platform is different)
if (hack-around-in-dev-struct())
return NULL;
#endif
All I want is
This is a device, the caller has said it may be DMA capable
dma_alloc_coherent
NULL. ok in this situation it isn't
I don't want to know about arch internals. I don't want to know about
platform specific DMA rules. I just want to be able to ask for DMA and
get told yes or no. Oops is not a useful error return.
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