1 files changed, 1 insertions, 1 deletions

diff --git a/sound/firewire/amdtp-am824.c b/sound/firewire/amdtp-am824.c
index cc6eb30f03a2..71168728940a 100644
--- a/sound/firewire/amdtp-am824.c
+++ b/sound/firewire/amdtp-am824.c
@@ -320,7 +320,7 @@ static void read_midi_messages(struct amdtp_stream *s,
         u8 *b;
 
         for (f = 0; f < frames; f++) {
-                port = (s->data_block_counter + f) % 8;
+                port = (8 - s->tx_first_dbc + s->data_block_counter + f) % 8;
                 b = (u8 *)&buffer[p->midi_position];
 
                 len = b[0] - 0x80;