be2net: free tx buffers when completions never arrive

be2net: free tx buffers when completions never arrive

In cases like when a pci device is disconnected on an error,
pending tx completions will never arrive. Unmap and free such
buffers in the tx cleanup path.

Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/benet/be_main.c

@@ -1128,6 +1128,9 @@ static void be_tx_compl_clean(struct be_adapter *adapter)
 	struct be_queue_info *txq = &adapter->tx_obj.q;
 	struct be_eth_tx_compl *txcp;
 	u16 end_idx, cmpl = 0, timeo = 0;
+	struct sk_buff **sent_skbs = adapter->tx_obj.sent_skb_list;
+	struct sk_buff *sent_skb;
+	bool dummy_wrb;
 
 	/* Wait for a max of 200ms for all the tx-completions to arrive. */
 	do {
@@ -1151,6 +1154,15 @@ static void be_tx_compl_clean(struct be_adapter *adapter)
 	if (atomic_read(&txq->used))
 		dev_err(&adapter->pdev->dev, "%d pending tx-completions\n",
 			atomic_read(&txq->used));
+
+	/* free posted tx for which compls will never arrive */
+	while (atomic_read(&txq->used)) {
+		sent_skb = sent_skbs[txq->tail];
+		end_idx = txq->tail;
+		index_adv(&end_idx,
+			wrb_cnt_for_skb(sent_skb, &dummy_wrb) - 1, txq->len);
+		be_tx_compl_process(adapter, end_idx);
+	}
 }
 
 static void be_mcc_queues_destroy(struct be_adapter *adapter)