[IB] uverbs: Close some exploitable races

Al Viro pointed out that the current IB userspace verbs interface
allows userspace to cause mischief by closing file descriptors before
we're ready, or issuing the same command twice at the same time.  This
patch closes those races, and fixes other obvious problems such as a
module reference leak.

Some other interface bogosities will require an ABI change to fix
properly, so I'm deferring those fixes until 2.6.15.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index e16cf94870f2..e6f4c9e55df7 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -665,7 +665,6 @@ struct ib_ucontext {
         struct list_head        qp_list;
         struct list_head        srq_list;
         struct list_head        ah_list;
-        spinlock_t              lock;
 };
 
 struct ib_uobject {