thunderbolt: Add helper to figure size of the ring

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>

diff --git a/include/linux/thunderbolt.h b/include/linux/thunderbolt.h
index 1160e0bf5c5b7828d14baf6bafffbf71ba7dda79..9df8a356396fd77cb52fb5f86b1d402358b63383 100644 (file)
--- 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,