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

Message ID 1263899307-10627-6-git-send-email-vapier@gentoo.org
State Not Applicable, archived
Delegated to: David Miller
Headers show

Commit Message

Mike Frysinger Jan. 19, 2010, 11:08 a.m. UTC 
From: Sonic Zhang <sonic.zhang@analog.com>

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

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) {