Merge branches 'irq-urgent-for-linus', 'x86-urgent-for-linus' and 'sched-urgent-for...

[pandora-kernel.git] / drivers / net / cxgb3 / l2t.h

diff --git a/drivers/net/cxgb3/l2t.h b/drivers/net/cxgb3/l2t.h
index 7a12d52..c5f5479 100644 (file)
--- a/drivers/net/cxgb3/l2t.h
+++ b/drivers/net/cxgb3/l2t.h
@@ -76,6 +76,7 @@ struct l2t_data {
        atomic_t nfree;         /* number of free entries */
        rwlock_t lock;
        struct l2t_entry l2tab[0];
+       struct rcu_head rcu_head;       /* to handle rcu cleanup */
 };
 
 typedef void (*arp_failure_handler_func)(struct t3cdev * dev,
@@ -99,7 +100,7 @@ static inline void set_arp_failure_handler(struct sk_buff *skb,
 /*
  * Getting to the L2 data from an offload device.
  */
-#define L2DATA(dev) ((dev)->l2opt)
+#define L2DATA(cdev) (rcu_dereference((cdev)->l2opt))
 
 #define W_TCB_L2T_IX    0
 #define S_TCB_L2T_IX    7
@@ -126,15 +127,22 @@ static inline int l2t_send(struct t3cdev *dev, struct sk_buff *skb,
        return t3_l2t_send_slow(dev, skb, e);
 }
 
-static inline void l2t_release(struct l2t_data *d, struct l2t_entry *e)
+static inline void l2t_release(struct t3cdev *t, struct l2t_entry *e)
 {
-       if (atomic_dec_and_test(&e->refcnt))
+       struct l2t_data *d;
+
+       rcu_read_lock();
+       d = L2DATA(t);
+
+       if (atomic_dec_and_test(&e->refcnt) && d)
                t3_l2e_free(d, e);
+
+       rcu_read_unlock();
 }
 
 static inline void l2t_hold(struct l2t_data *d, struct l2t_entry *e)
 {
-       if (atomic_add_return(1, &e->refcnt) == 1)      /* 0 -> 1 transition */
+       if (d && atomic_add_return(1, &e->refcnt) == 1) /* 0 -> 1 transition */
                atomic_dec(&d->nfree);
 }