--- zzzz-none-000/linux-3.10.107/include/linux/acpi_dma.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/linux/acpi_dma.h	2021-02-04 17:41:59.000000000 +0000
@@ -16,6 +16,7 @@
 
 #include <linux/list.h>
 #include <linux/device.h>
+#include <linux/err.h>
 #include <linux/dmaengine.h>
 
 /**
@@ -103,12 +104,12 @@
 static inline struct dma_chan *acpi_dma_request_slave_chan_by_index(
 		struct device *dev, size_t index)
 {
-	return NULL;
+	return ERR_PTR(-ENODEV);
 }
 static inline struct dma_chan *acpi_dma_request_slave_chan_by_name(
 		struct device *dev, const char *name)
 {
-	return NULL;
+	return ERR_PTR(-ENODEV);
 }
 
 #define acpi_dma_simple_xlate	NULL