diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index aff9018d0658..f51d376d10ba 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -718,11 +718,6 @@ static inline unsigned int ar_next_buffer_index(unsigned int index)
 	return (index + 1) % AR_BUFFERS;
 }
 
-static inline unsigned int ar_prev_buffer_index(unsigned int index)
-{
-	return (index - 1 + AR_BUFFERS) % AR_BUFFERS;
-}
-
 static inline unsigned int ar_first_buffer_index(struct ar_context *ctx)
 {
 	return ar_next_buffer_index(ctx->last_buffer_index);