[PATCH RESEND 0/2]: ixp4xx: Fix 3.7 regression for IXP4xx ethernet driver

[Simon Kågström]

Hi!

These two patches fixes the regression introduced in 3.7 by commit
1a4901177574083c35fafc24c4d151c2a7c7647c,

  ixp4xx_eth: avoid calling dma_pool_create() with NULL dev

The patch above is not incorrect itself, but causes the driver to fail
with

  [   33.055473] net eth1: coherent DMA mask is unset
  [   33.055523] net eth1: coherent allocation too big (requested 0x1000 mask 0x0)

The two patches fix this by generalizing and correcting the ixp4xx
dma_set_coherent_mask(), which earlier only dealt with the PCI case.
The second patch simply sets up the mask for the ixp4xx ethernet device.


The patches have been verified on a board with 256MiB memory, one
ipx4xx_eth device and a e100 PCI device, running Linus' tip.


This issue has been discussed before:

   https://lkml.org/lkml/2014/1/2/46
   http://lists.infradead.org/pipermail/linux-arm-kernel/2013-February/148811.html


This is a resend of the patch series. There was some discussion about it here:

  http://www.spinics.net/lists/arm-kernel/msg313082.html

and if I understand Russels comments (as per the documentation),
drivers should setup the coherent DMA mask even if it happens to be the
platform/CPU default.

// Simon