tree 09481629e751d4d853adb460e940779e384e5713
parent 4ffe722eefcb07c76701f03e0d759fbaecedf79f
author Mika Westerberg <mika.westerberg@linux.intel.com> 1506940722 +0300
committer David S. Miller <davem@davemloft.net> 1506968681 -0700

thunderbolt: Add function to retrieve DMA device for the ring

This is needed when Thunderbolt service drivers need to DMA map memory
before it is passed down to the ring.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>