[PATCH] falcon: pass valid pointer from ef4_enqueue_unwind.

[Young Xiao]

The bytes_compl and pkts_compl pointers passed to ef4_dequeue_buffers
cannot be NULL. Add a paranoid warning to check this condition and fix
the one case where they were NULL.

Signed-off-by: Young Xiao <92siuy...@gmail.com>
---
 drivers/net/ethernet/sfc/falcon/tx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/falcon/tx.c 
b/drivers/net/ethernet/sfc/falcon/tx.c
index c5059f4..ed89bc6 100644
--- a/drivers/net/ethernet/sfc/falcon/tx.c
+++ b/drivers/net/ethernet/sfc/falcon/tx.c
@@ -69,6 +69,7 @@ static void ef4_dequeue_buffer(struct ef4_tx_queue *tx_queue,
        }
 
        if (buffer->flags & EF4_TX_BUF_SKB) {
+               EF4_WARN_ON_PARANOID(!pkts_compl || !bytes_compl);
                (*pkts_compl)++;
                (*bytes_compl) += buffer->skb->len;
                dev_consume_skb_any((struct sk_buff *)buffer->skb);
@@ -271,12 +272,14 @@ static int ef4_tx_map_data(struct ef4_tx_queue *tx_queue, 
struct sk_buff *skb)
 static void ef4_enqueue_unwind(struct ef4_tx_queue *tx_queue)
 {
        struct ef4_tx_buffer *buffer;
+       unsigned int bytes_compl = 0;
+       unsigned int pkts_compl = 0;
 
        /* Work backwards until we hit the original insert pointer value */
        while (tx_queue->insert_count != tx_queue->write_count) {
                --tx_queue->insert_count;
                buffer = __ef4_tx_queue_get_insert_buffer(tx_queue);
-               ef4_dequeue_buffer(tx_queue, buffer, NULL, NULL);
+               ef4_dequeue_buffer(tx_queue, buffer, &pkts_compl, &bytes_compl);
        }
 }
 
-- 
2.7.4