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| author | Zach Brown <zach.brown@oracle.com> | 2010-07-23 10:32:31 -0700 |
|---|---|---|
| committer | Andy Grover <andy.grover@oracle.com> | 2010-09-08 18:16:47 -0700 |
| commit | 5adb5bc65f93e52341c3fc9d03d4030dd375e256 (patch) | |
| tree | 55b19c7757ccd64f58169a05cd63e91bee409bad /net/rds/connection.c | |
| parent | 77510481c0c3980c8979ed236d63e59221fb8ce5 (diff) | |
| download | blackbird-op-linux-5adb5bc65f93e52341c3fc9d03d4030dd375e256.tar.gz blackbird-op-linux-5adb5bc65f93e52341c3fc9d03d4030dd375e256.zip | |
RDS: have sockets get transport module references
Right now there's nothing to stop the various paths that use
rs->rs_transport from racing with rmmod and executing freed transport
code. The simple fix is to have binding to a transport also hold a
reference to the transport's module, removing this class of races.
We already had an unused t_owner field which was set for the modular
transports and which wasn't set for the built-in loop transport.
Signed-off-by: Zach Brown <zach.brown@oracle.com>
Diffstat (limited to 'net/rds/connection.c')
| -rw-r--r-- | net/rds/connection.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/rds/connection.c b/net/rds/connection.c index 75a1a37d64d3..968b7a798398 100644 --- a/net/rds/connection.c +++ b/net/rds/connection.c @@ -117,6 +117,7 @@ static struct rds_connection *__rds_conn_create(__be32 laddr, __be32 faddr, { struct rds_connection *conn, *parent = NULL; struct hlist_head *head = rds_conn_bucket(laddr, faddr); + struct rds_transport *loop_trans; unsigned long flags; int ret; @@ -163,7 +164,9 @@ static struct rds_connection *__rds_conn_create(__be32 laddr, __be32 faddr, * can bind to the destination address then we'd rather the messages * flow through loopback rather than either transport. */ - if (rds_trans_get_preferred(faddr)) { + loop_trans = rds_trans_get_preferred(faddr); + if (loop_trans) { + rds_trans_put(loop_trans); conn->c_loopback = 1; if (is_outgoing && trans->t_prefer_loopback) { /* "outgoing" connection - and the transport |
