On Wed, Jun 27, 2007 at 06:20:38AM -0500, Milton Miller wrote:

If CONFIG_PCMCIA=m then your notifier is not registered.  The modprobe 
of your of_driver loads ds.ko, registers the bus, then registers your 
driver.  When the socket driver tries to dma, the BUG in dma_64 for no 
archdata.dma_ops triggers.

It seems like we need

(1) a notifier that a bus is registered, run before allowing any 
devices, so that platforms can register bus notifiers by bus name 
before the devices and drivers are registered.

(2) a powerpc64 generic pcmcia bus notifier that copys the dma ops from 
the parent socket.

(3) something to set the dma_ops to direct_dma_ops on the of device.

If we don't want (3) to be in the driver (as Christoph previosly 
mentioned), then it needs to be a seperate bus that reuses the of 
matching.  This would be similar to how ibmebus is setup.   If I 
remember the discussion, ibmebus is to provide the alternate dma ops 
and steals match etc code from the of_platform bus type.


Oh, is this why you have depends on PCMCIA=y ?

Yes.


-Olof