tree 79a7efdc9a433f1c5f05651adc70c2579760c313
parent eee617a1c35dbf598690879f13dc3df548fd6ea6
author Ben Hutchings <ben.hutchings@codethink.co.uk> 1425343920 +0000
committer David S. Miller <davem@davemloft.net> 1425349856 -0500

sh_eth: Ensure proper ordering of descriptor active bit write/read

When submitting a DMA descriptor, the active bit must be written last.
When reading a completed DMA descriptor, the active bit must be read
first.

Add memory barriers to ensure that this ordering is maintained.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>