[ATM]: [he] don't hold the device lock when upcalling

This can create a deadlock/lock ordering problem with other layers
that want to use the transmit (or other) path of the card at that
time.
Signed-off-by: NChas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/atm/he.c

@@ -1928,7 +1928,9 @@ he_service_rbrq(struct he_dev *he_dev, int group)
 #ifdef notdef
 		ATM_SKB(skb)->vcc = vcc;
 #endif
+		spin_unlock(&he_dev->global_lock);
 		vcc->push(vcc, skb);
+		spin_lock(&he_dev->global_lock);
 
 		atomic_inc(&vcc->stats->rx);