1 files changed, 5 insertions, 3 deletions
diff --git a/hw/dma.c b/hw/dma.c
index c8ed6b0..ff1aa2e 100644
--- a/hw/dma.c
+++ b/hw/dma.c
@@ -345,9 +345,11 @@ static void channel_run (int ncont, int ichan)
 #endif
 
     r = dma_controllers[ncont].regs + ichan;
-    n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
-                             r->now[COUNT], (r->base[COUNT] + 1) << ncont);
-    r->now[COUNT] = n;
+    if (r->transfer_handler) {
+        n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
+                                 r->now[COUNT], (r->base[COUNT] + 1) << ncont);
+        r->now[COUNT] = n;
+    }
     ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont);
 }