[PATCH 6/9] thunderbolt: Add helper to figure size of the ring

[Mika Westerberg <mika.westerberg@linux.intel.com>]

Add to common header a function that returns size of the ring. This can
be used in the drivers instead of rolling own version.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 include/linux/thunderbolt.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/thunderbolt.h b/include/linux/thunderbolt.h
index 1160e0bf5c5b..9df8a356396f 100644
--- a/include/linux/thunderbolt.h
+++ b/include/linux/thunderbolt.h
@@ -641,6 +641,11 @@ static inline size_t tb_ring_frame_size(const struct ring_frame *frame)
 	return TB_MAX_FRAME_SIZE;
 }
 
+static inline size_t tb_ring_size(const struct tb_ring *ring)
+{
+	return ring->size;
+}
+
 struct tb_ring *tb_ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,
 				 unsigned int flags);
 struct tb_ring *tb_ring_alloc_rx(struct tb_nhi *nhi, int hop, int size,
-- 
2.50.1