[PATCH] RDMA/siw: Add missing rtnl_lock around access to ifa

[Jason Gunthorpe]

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@xxxxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
 drivers/infiniband/sw/siw/siw_cm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/sw/siw/siw_cm.c b/drivers/infiniband/sw/siw=
/siw_cm.c
index 8e618cb7261f62..c25be723c15b64 100644
--- 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 backlo=
g)
 			id, &s_laddr.sin_addr, ntohs(s_laddr.sin_port),
 			&s_raddr->sin_addr, ntohs(s_raddr->sin_port));
=20
+		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 backlo=
g)
 			}
 		}
 		endfor_ifa(in_dev);
+		rtnl_unlock();
 		in_dev_put(in_dev);
 	} else if (id->local_addr.ss_family =3D=3D AF_INET6) {
 		struct inet6_dev *in6_dev =3D in6_dev_get(dev);
--=20
2.21.0