RDMA/siw: Add missing rtnl_lock around access to ifa

ifa is protected by rcu or rtnl, add the missing locking. In this case we
have to use rtnl since siw_listen_address() is sleeping.

Fixes: 6c52fdc244b5 ("rdma/siw: connection management")
Reviewed-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/sw/siw/siw_cm.c b/drivers/infiniband/sw/siw/siw_cm.c
index 8e618cb..c25be72 100644 (file)
--- a/drivers/infiniband/sw/siw/siw_cm.c
+++ b/drivers/infiniband/sw/siw/siw_cm.c
@@ -1975,6 +1975,7 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
                        id, &s_laddr.sin_addr, ntohs(s_laddr.sin_port),
                        &s_raddr->sin_addr, ntohs(s_raddr->sin_port));
 
+               rtnl_lock();
                for_ifa(in_dev)
                {
                        if (ipv4_is_zeronet(s_laddr.sin_addr.s_addr) ||
@@ -1989,6 +1990,7 @@ int siw_create_listen(struct iw_cm_id *id, int backlog)
                        }
                }
                endfor_ifa(in_dev);
+               rtnl_unlock();
                in_dev_put(in_dev);
        } else if (id->local_addr.ss_family == AF_INET6) {
                struct inet6_dev *in6_dev = in6_dev_get(dev);