netdev - [PATCH 6/6] netdev: bfin_mac: avoid tx skb overflows in the tx DMA ring

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Message-Id: <1263899307-10627-6-git-send-email-vapier@gentoo.org>
Date:	Tue, 19 Jan 2010 06:08:27 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc:	uclinux-dist-devel@...ckfin.uclinux.org,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH 6/6] netdev: bfin_mac: avoid tx skb overflows in the tx DMA ring

From: Sonic Zhang <sonic.zhang@...log.com>

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 drivers/net/bfin_mac.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
index af45f65..f5a22c8 100644
--- a/drivers/net/bfin_mac.c
+++ b/drivers/net/bfin_mac.c
@@ -920,6 +920,9 @@ static int bfin_mac_hard_start_xmit(struct sk_buff *skb,
 	u32 data_align = (unsigned long)(skb->data) & 0x3;
 	union skb_shared_tx *shtx = skb_tx(skb);
 
+	if (current_tx_ptr->next == tx_list_head)
+		return NETDEV_TX_BUSY;
+
 	current_tx_ptr->skb = skb;
 
 	if (data_align == 0x2) {
-- 
1.6.6

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