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-rw-r--r--target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
index 9df27ff1a9..ce05c10882 100644
--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
@@ -28,6 +28,11 @@ static int ag71xx_msg_level = -1;
module_param_named(msg_level, ag71xx_msg_level, int, 0);
MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
+static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
+{
+ return ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
+}
+
static void ag71xx_dump_dma_regs(struct ag71xx *ag)
{
DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
@@ -1052,9 +1057,10 @@ static void ag71xx_netpoll(struct net_device *dev)
static int ag71xx_change_mtu(struct net_device *dev, int new_mtu)
{
struct ag71xx *ag = netdev_priv(dev);
+ unsigned int max_frame_len;
- if (new_mtu < 68 ||
- new_mtu > ag->max_frame_len - ETH_HLEN - ETH_FCS_LEN)
+ max_frame_len = ag71xx_max_frame_len(new_mtu);
+ if (new_mtu < 68 || max_frame_len > ag->max_frame_len)
return -EINVAL;
dev->mtu = new_mtu;