powerpc: Fix crash introduced with commit 5657933dbb6e

[Michael Ellerman]

On Fri, 2017-03-10 at 02:33:51 UTC, Larry Finger wrote:
> Code inserted during the code merged between kernels 4.10 and 4.11-rc1
> caused an early panic quickly followed by a complete shutdown for
> PowerPC. The traceback was not displayed long enough to read or
> photograph, thus it is not reproduced here.
> 
> The problem was bisected to commit 5657933dbb6e ("treewide: Move dma_ops
> from struct dev_archdata into struct device"). The problem was a missing
> copy of critical information from struct dev_archdata into struct device,
> leading to the dereference of a null pointer.
> 
> This fix was suggested by Benjamin Herrenschmidt.
> 
> Fixes: commit 5657933dbb6e ("treewide: Move dma_ops from struct dev_archdata into struct device")
> Signed-off-by: Larry Finger <Larry.Finger at lwfinger.net>
> Cc: linuxppc-dev at lists.ozlabs.org
> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Cc: regressions at leemhuis.info <regressions at leemhuis.info>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/46f401c4297a2232a037ad8801b6c8

cheers