From: Roland Dreier <roland@purestorage.com>
Date: Tue, 29 Aug 2017 10:34:44 -0700
Subject: IB/core: Add might_sleep() annotation to ib_init_ah_from_wc()
Patch-mainline: v4.14-rc1
Git-commit: 79364227e6b4923478e99d8480d62482b588ef84
References: bsc#1046306 FATE#322942
For RoCE, ib_init_ah_from_wc() can follow the path
ib_init_ah_from_wc() ->
rdma_addr_find_l2_eth_by_grh() ->
rdma_resolve_ip()
and rdma_resolve_ip() will sleep in kzalloc() and wait_for_completion().
However, developers will not see any warnings if they use ib_init_ah_from_wc()
in an atomic context and test only on IB, because the function doesn't
sleep in that case.
Add a might_sleep() so that lockdep will catch bugs no matter what hardware is
used to test.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/verbs.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -468,6 +468,8 @@ int ib_init_ah_from_wc(struct ib_device
union ib_gid dgid;
union ib_gid sgid;
+ might_sleep();
+
memset(ah_attr, 0, sizeof *ah_attr);
ah_attr->type = rdma_ah_find_type(device, port_num);
if (rdma_cap_eth_ah(device, port_num)) {