From: Roland Dreier <roland@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
---
drivers/infiniband/core/verbs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index b456e3ca1876..84868f76f8b9 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -478,6 +478,8 @@ int ib_init_ah_from_wc(struct ib_device *device, u8 port_num,
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)) {
--
2.14.1
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