queue->tx_skb = NULL;You also need to free the previously allocated rx buffers.
@@ -2568,6 +2574,16 @@ static int macb_alloc_consistent(struct macb *bp)
if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
goto out_err;
+ /* Required for tie off descriptor for PM cases */
+ if (!(bp->caps & MACB_CAPS_QUEUE_DISABLE)) {
+ bp->rx_ring_tieoff = dma_alloc_coherent(&bp->pdev->dev,
+ macb_dma_desc_get_size(bp),
+ &bp->rx_ring_tieoff_dma,
+ GFP_KERNEL);
+ if (!bp->rx_ring_tieoff)
+ goto out_err;
+ }
+
return 0;