async_tx: add missing DMA unmap to async_memcpy()

Do DMA unmap on ->device_prep_dma_memcpy failure.

Cc: Dan Williams <djbw@fb.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Dan Williams <djbw@fb.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
index 361b5e8239bc..9e62feffb374 100644
--- 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) {