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RDS: Fix locking in send on m_rs_lock 

Do not nest m_rs_lock under c_lock

Disable interrupts in {rdma,atomic}_send_complete

Signed-off-by: Andy Grover <andy.grover@oracle.com>
This commit is contained in:
Andy Grover 2010-03-29 16:50:54 -07:00
parent 7c82eaf00e
commit 9de0864cf5
1 changed files with 8 additions and 7 deletions
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15
net/rds/send.c
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@ -415,8 +415,9 @@ void rds_rdma_send_complete(struct rds_message *rm, int status)
struct rds_sock *rs = NULL;
struct rds_rdma_op *ro;
struct rds_notifier *notifier;
unsigned long flags;
spin_lock(&rm->m_rs_lock);
spin_lock_irqsave(&rm->m_rs_lock, flags);
ro = rm->m_rdma_op;
if (test_bit(RDS_MSG_ON_SOCK, &rm->m_flags) &&
@ -433,7 +434,7 @@ void rds_rdma_send_complete(struct rds_message *rm, int status)
ro->r_notifier = NULL;
}
spin_unlock(&rm->m_rs_lock);
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
if (rs) {
rds_wake_sk_sleep(rs);
@ -647,8 +648,8 @@ void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
list_for_each_entry(rm, &list, m_sock_item) {
conn = rm->m_inc.i_conn;
spin_lock_irqsave(&conn->c_lock, flags);
spin_lock_irqsave(&conn->c_lock, flags);
/*
* Maybe someone else beat us to removing rm from the conn.
* If we race with their flag update we'll get the lock and
@ -658,23 +659,23 @@ void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
spin_unlock_irqrestore(&conn->c_lock, flags);
continue;
}
list_del_init(&rm->m_conn_item);
spin_unlock_irqrestore(&conn->c_lock, flags);
/*
* Couldn't grab m_rs_lock in top loop (lock ordering),
* but we can now.
*/
spin_lock(&rm->m_rs_lock);
spin_lock_irqsave(&rm->m_rs_lock, flags);
spin_lock(&rs->rs_lock);
__rds_rdma_send_complete(rs, rm, RDS_RDMA_CANCELED);
spin_unlock(&rs->rs_lock);
rm->m_rs = NULL;
spin_unlock(&rm->m_rs_lock);
spin_unlock_irqrestore(&rm->m_rs_lock, flags);
list_del_init(&rm->m_conn_item);
rds_message_put(rm);
spin_unlock_irqrestore(&conn->c_lock, flags);
}
rds_wake_sk_sleep(rs);