dma-mapping: return error code from dma_dummy_map_sg()

iomartin · Christoph Hellwig · commit 66ab63104f9c · 2021-08-09T17:13:06.000+02:00
The .map_sg() op now expects an error code instead of zero on failure.

The only errno to return is -EINVAL in the case when DMA is not
supported.

Signed-off-by: Martin Oliveira &lt;martin.oliveira@eideticom.com&gt;
Signed-off-by: Logan Gunthorpe &lt;logang@deltatee.com&gt;
Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
diff --git a/kernel/dma/dummy.c b/kernel/dma/dummy.c
@@ -22,7 +22,7 @@ static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
 		int nelems, enum dma_data_direction dir,
 		unsigned long attrs)
 {
-	return 0;
+	return -EINVAL;
 }
 
 static int dma_dummy_supported(struct device *hwdev, u64 mask)

Original file line number	Diff line number	Diff line change
`@@ -22,7 +22,7 @@ static int dma_dummy_map_sg(struct device dev, struct scatterlist sgl,`
`22`	`22`	`int nelems, enum dma_data_direction dir,`
`23`	`23`	`unsigned long attrs)`
`24`	`24`	`{`
`25`		`- return 0;`
	`25`	`+ return -EINVAL;`
`26`	`26`	`}`
`27`	`27`
`28`	`28`	`static int dma_dummy_supported(struct device *hwdev, u64 mask)`