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-rw-r--r--target/linux/ramips/files/drivers/net/ethernet/ralink/ralink_soc_eth.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/target/linux/ramips/files/drivers/net/ethernet/ralink/ralink_soc_eth.c b/target/linux/ramips/files/drivers/net/ethernet/ralink/ralink_soc_eth.c
index 2691cfb..05b810a 100644
--- a/target/linux/ramips/files/drivers/net/ethernet/ralink/ralink_soc_eth.c
+++ b/target/linux/ramips/files/drivers/net/ethernet/ralink/ralink_soc_eth.c
@@ -32,6 +32,7 @@
#include <linux/reset.h>
#include <linux/tcp.h>
#include <linux/io.h>
+#include <linux/bug.h>
#include <asm/mach-ralink/ralink_regs.h>
@@ -41,8 +42,8 @@
#include "ralink_ethtool.h"
#define MAX_RX_LENGTH 1536
-#define FE_RX_HLEN (NET_SKB_PAD + VLAN_ETH_HLEN + VLAN_HLEN + \
- + NET_IP_ALIGN + ETH_FCS_LEN)
+#define FE_RX_ETH_HLEN (VLAN_ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN)
+#define FE_RX_HLEN (NET_SKB_PAD + FE_RX_ETH_HLEN + NET_IP_ALIGN)
#define DMA_DUMMY_DESC 0xffffffff
#define FE_DEFAULT_MSG_ENABLE \
(NETIF_MSG_DRV | \
@@ -172,14 +173,21 @@ static int fe_set_mac_address(struct net_device *dev, void *p)
static inline int fe_max_frag_size(int mtu)
{
+ /* make sure buf_size will be at least MAX_RX_LENGTH */
+ if (mtu + FE_RX_ETH_HLEN < MAX_RX_LENGTH)
+ mtu = MAX_RX_LENGTH - FE_RX_ETH_HLEN;
+
return SKB_DATA_ALIGN(FE_RX_HLEN + mtu) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
static inline int fe_max_buf_size(int frag_size)
{
- return frag_size - NET_SKB_PAD - NET_IP_ALIGN -
- SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+ int buf_size = frag_size - NET_SKB_PAD - NET_IP_ALIGN -
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+
+ BUG_ON(buf_size < MAX_RX_LENGTH);
+ return buf_size;
}
static inline void fe_get_rxd(struct fe_rx_dma *rxd, struct fe_rx_dma *dma_rxd)