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UCP/AM: Fix request datatype state during CM switch - v1.11.x #7436

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Sep 22, 2021
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UCP/AM: Fix request datatype state during CM switch - v1.11.x #7436

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5 changes: 4 additions & 1 deletion src/ucp/proto/proto_am.inl
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Original file line number Diff line number Diff line change
Expand Up @@ -297,12 +297,15 @@ ucs_status_t ucp_do_am_zcopy_single(uct_pending_req_t *self, uint8_t am_id,
ucp_ep_t *ep = req->send.ep;
size_t max_iov = ucp_ep_config(ep)->am.max_iov;
uct_iov_t *iov = ucs_alloca(max_iov * sizeof(uct_iov_t));
ucp_dt_state_t state = req->send.state.dt;
ucp_dt_state_t state;
ucs_status_t status;

req->send.lane = ucp_ep_get_am_lane(ep);
ucp_send_request_add_reg_lane(req, req->send.lane);

/* Cache datatype state only after registering the lane, since registering
the lane can change the state */
state = req->send.state.dt;
status = ucp_am_zcopy_common(req, hdr, hdr_size, user_hdr_desc, user_hdr_size,
iov, max_iov, req->send.length + user_hdr_size,
am_id, &state);
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