static inline size_t nvme_tcp_req_cur_length(struct nvme_tcp_request *req)
 {
-	return min_t(size_t, req->iter.bvec->bv_len - req->iter.iov_offset,
-			req->pdu_len - req->pdu_sent);
+	return min_t(size_t, req->iter.count,
+			min_t(size_t, req->iter.bvec->bv_len - req->iter.iov_offset,
+				req->pdu_len - req->pdu_sent));

We are not supposed to directly poke into an iov_iter.

I suspect this should be something like:

	return min_t(size_t, iov_iter_single_seg_count(&req->iter),
		     req->pdu_len - req->pdu_sent);

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