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RDS: Fix locking in rds_send_drop_to() 

It seems rds_send_drop_to() called
__rds_rdma_send_complete(rs, rm, RDS_RDMA_CANCELED)
with only rds_sock lock, but not rds_message lock. It raced with
other threads that is attempting to modify the rds_message as well,
such as from within rds_rdma_send_complete().

Signed-off-by: Tina Yang <tina.yang@oracle.com>
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tina Yang 2010-03-11 13:50:03 +00:00 committed by David S. Miller
parent 97069788d6
commit 550a8002e4
1 changed files with 7 additions and 6 deletions
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13
net/rds/send.c
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@ -632,9 +632,6 @@ void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
list_move(&rm->m_sock_item, &list);
rds_send_sndbuf_remove(rs, rm);
clear_bit(RDS_MSG_ON_SOCK, &rm->m_flags);
/* If this is a RDMA operation, notify the app. */
__rds_rdma_send_complete(rs, rm, RDS_RDMA_CANCELED);
}
/* order flag updates with the rs lock */
@ -643,9 +640,6 @@ void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
spin_unlock_irqrestore(&rs->rs_lock, flags);
if (wake)
rds_wake_sk_sleep(rs);
conn = NULL;
/* now remove the messages from the conn list as needed */
@ -653,6 +647,10 @@ void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
/* We do this here rather than in the loop above, so that
* we don't have to nest m_rs_lock under rs->rs_lock */
spin_lock_irqsave(&rm->m_rs_lock, flags2);
/* If this is a RDMA operation, notify the app. */
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_irqrestore(&rm->m_rs_lock, flags2);
@ -681,6 +679,9 @@ void rds_send_drop_to(struct rds_sock *rs, struct sockaddr_in *dest)
if (conn)
spin_unlock_irqrestore(&conn->c_lock, flags);
if (wake)
rds_wake_sk_sleep(rs);
while (!list_empty(&list)) {
rm = list_entry(list.next, struct rds_message, m_sock_item);
list_del_init(&rm->m_sock_item);