1 files changed, 8 insertions, 10 deletions

diff --git a/drivers/net/wan/hdlc_cisco.c b/drivers/net/wan/hdlc_cisco.c
index cf5fd17ad707..f1bff98acd1f 100644
--- a/drivers/net/wan/hdlc_cisco.c
+++ b/drivers/net/wan/hdlc_cisco.c
@@ -58,8 +58,7 @@ struct cisco_state {
         spinlock_t lock;
         unsigned long last_poll;
         int up;
-        int request_sent;
-        u32 txseq; /* TX sequence number */
+        u32 txseq; /* TX sequence number, 0 = none */
         u32 rxseq; /* RX sequence number */
 };
 
@@ -163,6 +162,7 @@ static int cisco_rx(struct sk_buff *skb)
         struct cisco_packet *cisco_data;
         struct in_device *in_dev;
         __be32 addr, mask;
+        u32 ack;
 
         if (skb->len < sizeof(struct hdlc_header))
                 goto rx_error;
@@ -223,8 +223,10 @@ static int cisco_rx(struct sk_buff *skb)
                 case CISCO_KEEPALIVE_REQ:
                         spin_lock(&st->lock);
                         st->rxseq = ntohl(cisco_data->par1);
-                        if (st->request_sent &&
-                            ntohl(cisco_data->par2) == st->txseq) {
+                        ack = ntohl(cisco_data->par2);
+                        if (ack && (ack == st->txseq ||
+                                    /* our current REQ may be in transit */
+                                    ack == st->txseq - 1)) {
                                 st->last_poll = jiffies;
                                 if (!st->up) {
                                         u32 sec, min, hrs, days;
@@ -275,7 +277,6 @@ static void cisco_timer(unsigned long arg)
 
         cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq),
                              htonl(st->rxseq));
-        st->request_sent = 1;
         spin_unlock(&st->lock);
 
         st->timer.expires = jiffies + st->settings.interval * HZ;
@@ -293,9 +294,7 @@ static void cisco_start(struct net_device *dev)
         unsigned long flags;
 
         spin_lock_irqsave(&st->lock, flags);
-        st->up = 0;
-        st->request_sent = 0;
-        st->txseq = st->rxseq = 0;
+        st->up = st->txseq = st->rxseq = 0;
         spin_unlock_irqrestore(&st->lock, flags);
 
         init_timer(&st->timer);
@@ -317,8 +316,7 @@ static void cisco_stop(struct net_device *dev)
 
         spin_lock_irqsave(&st->lock, flags);
         netif_dormant_on(dev);
-        st->up = 0;
-        st->request_sent = 0;
+        st->up = st->txseq = 0;
         spin_unlock_irqrestore(&st->lock, flags);
 }