[NET]: Add some acquires/releases sparse annotations.

Add __acquires() and __releases() annotations to suppress some sparse
warnings.

example of warnings :

net/ipv4/udp.c:1555:14: warning: context imbalance in 'udp_seq_start' - wrong
count at exit
net/ipv4/udp.c:1571:13: warning: context imbalance in 'udp_seq_stop' -
unexpected unlock

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c
index 9d5404158476..ee1ffdb3044f 100644
--- a/net/ipv4/fib_hash.c
+++ b/net/ipv4/fib_hash.c
@@ -936,6 +936,7 @@ static struct fib_alias *fib_get_idx(struct seq_file *seq, loff_t pos)
 }
 
 static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(fib_hash_lock)
 {
 	void *v = NULL;
 
@@ -952,6 +953,7 @@ static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 }
 
 static void fib_seq_stop(struct seq_file *seq, void *v)
+	__releases(fib_hash_lock)
 {
 	read_unlock(&fib_hash_lock);
 }