From: Shradha Shah <redacted>
Date: Wed, 28 May 2014 10:23:01 +0100

This patch series 
Fixes: ee45fd92c739db5b7950163d91dfe5f016af6d24

The linux net driver uses memcpy_toio() in order to copy into
the PIO buffers.
Even on a 64bit machine this causes 32bit accesses to a write-
combined memory region.
There are hardware limitations that mean that only
64bit naturally aligned accesses are safe in all cases. Due to being
write-combined memory region two 32bit accesses may be coalesced to
form a 64bit non 64bit aligned access.
Solution was to open-code the memory copy routines using pointers
and to only enable PIO for x86_64 machines.

This bug fix applies to v3.13 and v3.14 stable branches.

You submited this twice and I'm still confused which ones I should
use.

Please resubmit this and address Sergei's feedback, thank you.