set_chmap could come tool early

Signed-off-by: Serhiy Katsyuba <serhiy.katsyuba@intel.com>

Author: serhiy-katsyuba-intel

src/audio/copier/copier.c

@@ -788,8 +788,13 @@ static int set_chmap(struct comp_dev *dev, const void *data, size_t data_size)
 		return -EINVAL;
 	}
 
-	/// !!! ADD COMMENT !!!
-	assert(cd->dd[0]->dma_buffer);
+	if (!cd->dd[0]->dma_buffer) {
+		/// !!! ADD COMMENT !!!
+		/// This is atomic !!!
+		cd->dd[0]->chmap = chmap_cfg->channel_map;
+		return 0;
+	}
+
 	dma_buf_channels = audio_stream_get_channels(&cd->dd[0]->dma_buffer->stream);
 
 	if (cd->direction == SOF_IPC_STREAM_PLAYBACK) {