async_tx: add missing DMA unmap to async_memcpy()

Do DMA unmap on ->device_prep_dma_memcpy failure. Cc: Dan Williams <[email protected]> Cc: Tomasz Figa <[email protected]> Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]> Signed-off-by: Kyungmin Park <[email protected]> Signed-off-by: Dan Williams <[email protected]>
thomasl · Jan 8, 2013 · 35fa4db · 35fa4db
1 parent 2c88ae9
commit 35fa4db
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
@@ -67,6 +67,12 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
 
 		tx = device->device_prep_dma_memcpy(chan, dma_dest, dma_src,
 						    len, dma_prep_flags);
+		if (!tx) {
+			dma_unmap_page(device->dev, dma_dest, len,
+				       DMA_FROM_DEVICE);
+			dma_unmap_page(device->dev, dma_src, len,
+				       DMA_TO_DEVICE);
+		}
 	}
 
 	if (tx) {