habanalabs/gaudi2: add razwi notify event

Each time razwi (read-only zero, write ignored) event happens, besides
capturing its data, also notify the user about it.
Signed-off-by: Dani Liberman <dliberman@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/device.c

@@ -2414,7 +2414,9 @@ void hl_handle_razwi(struct hl_device *hdev, u64 addr, u16 *engine_id, u16 num_o
 			u8 flags, u64 *event_mask)
 {
 	hl_capture_razwi(hdev, addr, engine_id, num_of_engines, flags);
-	*event_mask |= HL_NOTIFIER_EVENT_RAZWI;
+
+	if (event_mask)
+		*event_mask |= HL_NOTIFIER_EVENT_RAZWI;
 }
 
 static void hl_capture_user_mappings(struct hl_device *hdev, bool is_pmmu)