path: root/net/rds
diff options
authorjeff.liu <jeff.liu@oracle.com>2012-10-08 18:57:27 +0000
committerDavid S. Miller <davem@davemloft.net>2012-10-09 13:57:23 -0400
commit5175a5e76bbdf20a614fb47ce7a38f0f39e70226 (patch)
tree83a7113b1b7fd3f6d7b2222d66884da291afe328 /net/rds
parent4085a7f0a09c73ef3e9de113c9f04d78c79be645 (diff)
RDS: fix rds-ping spinlock recursion
This is the revised patch for fixing rds-ping spinlock recursion according to Venkat's suggestions. RDS ping/pong over TCP feature has been broken for years(2.6.39 to 3.6.0) since we have to set TCP cork and call kernel_sendmsg() between ping/pong which both need to lock "struct sock *sk". However, this lock has already been hold before rds_tcp_data_ready() callback is triggerred. As a result, we always facing spinlock resursion which would resulting in system panic. Given that RDS ping is only used to test the connectivity and not for serious performance measurements, we can queue the pong transmit to rds_wq as a delayed response. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> CC: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com> CC: David S. Miller <davem@davemloft.net> CC: James Morris <james.l.morris@oracle.com> Signed-off-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
1 files changed, 1 insertions, 1 deletions
diff --git a/net/rds/send.c b/net/rds/send.c
index 96531d4033a..88eace57dd6 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -1122,7 +1122,7 @@ rds_send_pong(struct rds_connection *conn, __be16 dport)
if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags))
- rds_send_xmit(conn);
+ queue_delayed_work(rds_wq, &conn->c_send_w, 0);
return 0;