netdev - [PATCH 2/7] 8139cp: Fix tx_queued debug message to print correct slot numbers

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Message-ID: <1442997846.36485.46.camel@infradead.org>
Date:	Wed, 23 Sep 2015 09:44:06 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	netdev@...r.kernel.org
Cc:	Francois Romieu <romieu@...zoreil.com>
Subject: [PATCH 2/7] 8139cp: Fix tx_queued debug message to print correct
 slot numbers

From: David Woodhouse <David.Woodhouse@...el.com>

After a certain amount of staring at the debug output of this driver, I
realised it was lying to me.

Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
---
 drivers/net/ethernet/realtek/8139cp.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index 947932d..cbca0de 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -786,7 +786,8 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
 		wmb();
 
 		cp->tx_skb[entry] = skb;
-		entry = NEXT_TX(entry);
+		netif_dbg(cp, tx_queued, cp->dev, "tx queued, slot %d, skblen %d\n",
+			  entry, skb->len);
 	} else {
 		struct cp_desc *txd;
 		u32 first_len, first_eor;
@@ -805,7 +806,6 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
 			goto out_dma_error;
 
 		cp->tx_skb[entry] = skb;
-		entry = NEXT_TX(entry);
 
 		for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
 			const skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
@@ -813,6 +813,8 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
 			u32 ctrl;
 			dma_addr_t mapping;
 
+			entry = NEXT_TX(entry);
+
 			len = skb_frag_size(this_frag);
 			mapping = dma_map_single(&cp->pdev->dev,
 						 skb_frag_address(this_frag),
@@ -848,9 +850,7 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
 
 			txd->opts1 = cpu_to_le32(ctrl);
 			wmb();
-
 			cp->tx_skb[entry] = skb;
-			entry = NEXT_TX(entry);
 		}
 
 		txd = &cp->tx_ring[first_entry];
@@ -873,12 +873,13 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
 			txd->opts1 = cpu_to_le32(first_eor | first_len |
 						 FirstFrag | DescOwn);
 		wmb();
+
+		netif_dbg(cp, tx_queued, cp->dev, "tx queued, slots %d-%d, skblen %d\n",
+			  first_entry, entry, skb->len);
 	}
-	cp->tx_head = entry;
+	cp->tx_head = NEXT_TX(entry);
 
 	netdev_sent_queue(dev, skb->len);
-	netif_dbg(cp, tx_queued, cp->dev, "tx queued, slot %d, skblen %d\n",
-		  entry, skb->len);
 	if (TX_BUFFS_AVAIL(cp) <= (MAX_SKB_FRAGS + 1))
 		netif_stop_queue(dev);
 
-- 
2.4.3

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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