RDS: Move loop-only function to loop.c
Also, try to better-document the locking around the
rm and its m_inc in loop.c.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/loop.c b/net/rds/loop.c
index 9364de6..4a3dd49 100644
--- a/net/rds/loop.c
+++ b/net/rds/loop.c
@@ -64,7 +64,8 @@
BUG_ON(hdr_off || sg || off);
rds_inc_init(&rm->m_inc, conn, conn->c_laddr);
- rds_message_addref(rm); /* for the inc */
+ /* For the embedded inc. Matching put is in loop_inc_free() */
+ rds_message_addref(rm);
rds_recv_incoming(conn, conn->c_laddr, conn->c_faddr, &rm->m_inc,
GFP_KERNEL, KM_USER0);
@@ -77,6 +78,16 @@
return sizeof(struct rds_header) + be32_to_cpu(rm->m_inc.i_hdr.h_len);
}
+/*
+ * See rds_loop_xmit(). Since our inc is embedded in the rm, we
+ * make sure the rm lives at least until the inc is done.
+ */
+static void rds_loop_inc_free(struct rds_incoming *inc)
+{
+ struct rds_message *rm = container_of(inc, struct rds_message, m_inc);
+ rds_message_put(rm);
+}
+
static int rds_loop_xmit_cong_map(struct rds_connection *conn,
struct rds_cong_map *map,
unsigned long offset)
@@ -176,6 +187,6 @@
.conn_connect = rds_loop_conn_connect,
.conn_shutdown = rds_loop_conn_shutdown,
.inc_copy_to_user = rds_message_inc_copy_to_user,
- .inc_free = rds_message_inc_free,
+ .inc_free = rds_loop_inc_free,
.t_name = "loopback",
};