[IPV4] ROUTE: Avoid sparse warnings

[Eric Dumazet]

  CHECK   net/ipv4/route.c
net/ipv4/route.c:298:2: warning: context imbalance in 'rt_cache_get_first' - 
wrong count at exit
net/ipv4/route.c:307:3: warning: context imbalance in 'rt_cache_get_next' - 
unexpected unlock
net/ipv4/route.c:346:3: warning: context imbalance in 'rt_cache_seq_stop' - 
unexpected unlock

Signed-off-by: Eric Dumazet <[EMAIL PROTECTED]>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 10915bb..fec0571 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -289,11 +289,11 @@ static struct rtable *rt_cache_get_first(struct seq_file 
*seq)
        struct rt_cache_iter_state *st = seq->private;
 
        for (st->bucket = rt_hash_mask; st->bucket >= 0; --st->bucket) {
-               rcu_read_lock_bh();
                r = rt_hash_table[st->bucket].chain;
                if (r)
                        break;
                rcu_read_unlock_bh();
+               rcu_read_lock_bh();
        }
        return r;
 }
@@ -305,9 +305,9 @@ static struct rtable *rt_cache_get_next(struct seq_file 
*seq, struct rtable *r)
        r = r->u.dst.rt_next;
        while (!r) {
                rcu_read_unlock_bh();
+               rcu_read_lock_bh();
                if (--st->bucket < 0)
                        break;
-               rcu_read_lock_bh();
                r = rt_hash_table[st->bucket].chain;
        }
        return r;
@@ -324,7 +324,9 @@ static struct rtable *rt_cache_get_idx(struct seq_file 
*seq, loff_t pos)
 }
 
 static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)
+       __acquires(RCU_BH)
 {
+       rcu_read_lock_bh();
        return *pos ? rt_cache_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 }
 
@@ -341,9 +343,9 @@ static void *rt_cache_seq_next(struct seq_file *seq, void 
*v, loff_t *pos)
 }
 
 static void rt_cache_seq_stop(struct seq_file *seq, void *v)
+       __releases(RCU_BH)
 {
-       if (v && v != SEQ_START_TOKEN)
-               rcu_read_unlock_bh();
+       rcu_read_unlock_bh();
 }
 
 static int rt_cache_seq_show(struct seq_file *seq, void *v)
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at  http://vger.kernel.org/majordomo-info.html