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From 2d12a9abf3f81de5b51852e3cfcba8cedac82642 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Fri, 6 Dec 2013 01:14:52 +0100
Subject: [PATCH] bgmac: check length of received frame
---
drivers/net/ethernet/broadcom/bgmac.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -347,6 +347,7 @@ static int bgmac_dma_rx_read(struct bgma
struct sk_buff *skb = slot->skb;
struct bgmac_rx_header *rx;
u16 len, flags;
+ int count;
/* Unmap buffer to make it accessible to the CPU */
dma_sync_single_for_cpu(dma_dev, slot->dma_addr,
@@ -355,6 +356,12 @@ static int bgmac_dma_rx_read(struct bgma
/* Get info from the header */
rx = (struct bgmac_rx_header *)skb->data;
len = le16_to_cpu(rx->len);
+ for (count = 0; count < 200; count++) {
+ len = le16_to_cpu(rx->len);
+ if (len)
+ break;
+ udelay(1);
+ }
flags = le16_to_cpu(rx->flags);
do {
@@ -362,7 +369,7 @@ static int bgmac_dma_rx_read(struct bgma
int err;
/* Check for poison and drop or pass the packet */
- if (len == 0xdead && flags == 0xbeef) {
+ if (!len || (len == 0xdead && flags == 0xbeef)) {
bgmac_err(bgmac, "Found poisoned packet at slot %d, DMA issue!\n",
ring->start);
dma_sync_single_for_device(dma_dev,
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