thunderbolt: Export ring handling functions to modules
These are used by Thunderbolt services to send and receive frames over the high-speed DMA rings. We also put the functions to tb_ namespace to make sure we do not collide with others and add missing kernel-doc comments for the exported functions. Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: NMichael Jamet <michael.jamet@intel.com> Reviewed-by: NYehezkel Bernat <yehezkel.bernat@intel.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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