diff options
Diffstat (limited to 'net/rds/send.c')
| -rw-r--r-- | net/rds/send.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/net/rds/send.c b/net/rds/send.c index de5693cdcefb..663fd60b40cf 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -112,6 +112,7 @@ int rds_send_xmit(struct rds_connection *conn) unsigned int tmp; struct scatterlist *sg; int ret = 0; + int gen = 0; LIST_HEAD(to_be_dropped); restart: @@ -134,6 +135,8 @@ restart: if (conn->c_trans->xmit_prepare) conn->c_trans->xmit_prepare(conn); + gen = atomic_inc_return(&conn->c_send_generation); + /* * spin trying to push headers and data down the connection until * the connection doesn't make forward progress. @@ -359,13 +362,13 @@ restart: if (ret == 0) { /* A simple bit test would be way faster than taking the * spin lock */ - spin_lock_irqsave(&conn->c_lock, flags); + smp_mb(); if (!list_empty(&conn->c_send_queue)) { rds_stats_inc(s_send_lock_queue_raced); - spin_unlock_irqrestore(&conn->c_lock, flags); - goto restart; + if (gen == atomic_read(&conn->c_send_generation)) { + goto restart; + } } - spin_unlock_irqrestore(&conn->c_lock, flags); } out: return ret; |