[PATCH net-next 07/14] rxrpc: rxrpc_connection_lock shouldn't be a BH lock, but conn_lock is [ver #2]

From: David Howells
Date: Wed Jun 22 2016 - 12:04:32 EST


rxrpc_connection_lock shouldn't be accessed as a BH-excluding lock. It's
only accessed in a few places and none of those are in BH-context.

rxrpc_transport::conn_lock, however, *is* a BH-excluding lock and should be
accessed so consistently.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

net/rxrpc/conn_object.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/rxrpc/conn_object.c b/net/rxrpc/conn_object.c
index 3b42fc4f4fe3..cab2f6dbc5a1 100644
--- a/net/rxrpc/conn_object.c
+++ b/net/rxrpc/conn_object.c
@@ -356,9 +356,9 @@ static int rxrpc_connect_exclusive(struct rxrpc_sock *rx,
return ret;
}

- write_lock_bh(&rxrpc_connection_lock);
+ write_lock(&rxrpc_connection_lock);
list_add_tail(&conn->link, &rxrpc_connections);
- write_unlock_bh(&rxrpc_connection_lock);
+ write_unlock(&rxrpc_connection_lock);

spin_lock(&trans->client_lock);
atomic_inc(&trans->usage);
@@ -677,9 +677,9 @@ rxrpc_incoming_connection(struct rxrpc_transport *trans, struct sk_buff *skb)

write_unlock_bh(&trans->conn_lock);

- write_lock_bh(&rxrpc_connection_lock);
+ write_lock(&rxrpc_connection_lock);
list_add_tail(&conn->link, &rxrpc_connections);
- write_unlock_bh(&rxrpc_connection_lock);
+ write_unlock(&rxrpc_connection_lock);

new = "new";

@@ -828,7 +828,7 @@ static void rxrpc_connection_reaper(struct work_struct *work)
now = ktime_get_seconds();
earliest = ULONG_MAX;

- write_lock_bh(&rxrpc_connection_lock);
+ write_lock(&rxrpc_connection_lock);
list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) {
_debug("reap CONN %d { u=%d,t=%ld }",
conn->debug_id, atomic_read(&conn->usage),
@@ -838,7 +838,7 @@ static void rxrpc_connection_reaper(struct work_struct *work)
continue;

spin_lock(&conn->trans->client_lock);
- write_lock(&conn->trans->conn_lock);
+ write_lock_bh(&conn->trans->conn_lock);
reap_time = conn->put_time + rxrpc_connection_expiry;

if (atomic_read(&conn->usage) > 0) {
@@ -860,10 +860,10 @@ static void rxrpc_connection_reaper(struct work_struct *work)
earliest = reap_time;
}

- write_unlock(&conn->trans->conn_lock);
+ write_unlock_bh(&conn->trans->conn_lock);
spin_unlock(&conn->trans->client_lock);
}
- write_unlock_bh(&rxrpc_connection_lock);
+ write_unlock(&rxrpc_connection_lock);

if (earliest != ULONG_MAX) {
_debug("reschedule reaper %ld", (long) earliest - now);