dma: check map_single return value properly

Signed-off-by: federico.vaga@cern.ch <federico.vaga@cern.ch>

dma: check map_single return value properly
Signed-off-by: federico.vaga@cern.ch <federico.vaga@cern.ch>
72e7fe42 · Federico Vaga · 7d22c3d7 · 72e7fe42
Commit 72e7fe42 authored Aug 22, 2018 by Federico Vaga
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dma.c dma.c +2 -1

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--- a/dma.c
+++ b/dma.c
@@ -222,7 +222,8 @@ int zio_dma_map_sg(struct zio_dma_sgt *zdma, size_t page_desc_size,
 	zdma->dma_page_desc_pool = dma_map_single(zdma->hwdev,
 						  zdma->page_desc_pool, size,
 						  DMA_TO_DEVICE);
-	if (!zdma->dma_page_desc_pool) {
+	if (dma_mapping_error(zdma->hwdev, zdma->dma_page_desc_pool)) {
+		dev_err(zdma->hwdev, "cannot map dma memory for descriptors\n");
 		err = -ENOMEM;
 		goto out_map_single;
 	}