[PATCH] of/device: Really only set bus DMA mask when appropriate

On 2018-11-07 8:03 am, Christoph Hellwig wrote:

On Tue, Nov 06, 2018 at 11:54:15AM +0000, Robin Murphy wrote:

quoted

of_dma_configure() was *supposed* to be following the same logic as
acpi_dma_configure() and only setting bus_dma_mask if some range was
specified by the firmware. However, it seems that subtlety got lost in
the process of fitting it into the differently-shaped control flow, and
as a result the force_dma==true case ends up always setting the bus mask
to the 32-bit default, which is not what anyone wants.

Make sure we only touch it if the DT actually said so.

This looks good, but I think it could really use a comment as the use
of ret all the way down the function isn't exactly obvious.

Fair point.

Let me now if you want this picked up through the OF or DMA trees.

I don't mind either way; I figure I'll wait a bit longer to see if Rob 
has any preference, then resend with the comment and the tags picked up 
so it can hopefully make rc2.

Robin.