Propagate read-only flag from sycl_usm_array_interface in asarray

dpctl/tensor/_ctors.py

@@ -202,6 +202,13 @@ def _usm_ndarray_from_suai(obj):
         buffer=membuf,
         strides=sua_iface.get("strides", None),
     )
+    _data_field = sua_iface["data"]
+    if isinstance(_data_field, tuple) and len(_data_field) > 1:
+        ro_field = _data_field[1]
+    else:
+        ro_field = False
+    if ro_field:
+        ary.flags["W"] = False
     return ary
 
 

dpctl/tests/test_usm_ndarray_ctor.py

@@ -2368,3 +2368,28 @@ def test_gh_1201():
     c = dpt.flip(dpt.empty(a.shape, dtype=a.dtype))
     c[:] = a
     assert (dpt.asnumpy(c) == a).all()
+
+
+class ObjWithSyclUsmArrayInterface:
+    def __init__(self, ary):
+        self._array_obj = ary
+
+    @property
+    def __sycl_usm_array_interface__(self):
+        _suai = self._array_obj.__sycl_usm_array_interface__
+        return _suai
+
+
+def test_asarray_writable_flag():
+    try:
+        a = dpt.empty(8)
+    except dpctl.SyclDeviceCreationError:
+        pytest.skip("No SYCL devices available")
+
+    a.flags["W"] = False
+    wrapped = ObjWithSyclUsmArrayInterface(a)
+
+    b = dpt.asarray(wrapped)
+
+    assert not b.flags["W"]
+    assert b._pointer == a._pointer