rds: block ints when acquiring c_lock in rds_conn_message_info()
conn->c_lock is acquired in interrupt context. rds_conn_message_info() is
called from user context and was acquiring c_lock without blocking interrupts,
leading to possible deadlocks.
Signed-off-by: Zach Brown <zach.brown@oracle.com>
diff --git a/net/rds/connection.c b/net/rds/connection.c
index 5bd96d53..5bb0eec 100644
--- a/net/rds/connection.c
+++ b/net/rds/connection.c
@@ -375,6 +375,7 @@
struct rds_connection *conn;
struct rds_message *rm;
unsigned int total = 0;
+ unsigned long flags;
size_t i;
len /= sizeof(struct rds_info_message);
@@ -389,7 +390,7 @@
else
list = &conn->c_retrans;
- spin_lock(&conn->c_lock);
+ spin_lock_irqsave(&conn->c_lock, flags);
/* XXX too lazy to maintain counts.. */
list_for_each_entry(rm, list, m_conn_item) {
@@ -400,7 +401,7 @@
conn->c_faddr, 0);
}
- spin_unlock(&conn->c_lock);
+ spin_unlock_irqrestore(&conn->c_lock, flags);
}
}
rcu_read_unlock();