[PATCH 2/3] dma: mv_xor: fix DMA-API error handling sanity check

[Lubomir Rintel]

Add error checking.
---
 drivers/dma/mv_xor.c |   27 ++++++++++++++++++++++++++-
 1 files changed, 26 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 8b81a04..d00a834 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -939,9 +939,21 @@ static int mv_xor_memcpy_self_test(struct mv_xor_chan 
*mv_chan)
 
        dest_dma = dma_map_single(dma_chan->device->dev, dest,
                                  MV_XOR_TEST_SIZE, DMA_FROM_DEVICE);
+       if (dma_mapping_error(dma_chan->device->dev, dest_dma)) {
+               dev_err(dma_chan->device->dev,
+                       "Could not map destination buffer, disabling\n");
+               err = -ENODEV;
+               goto free_resources;
+       }
 
        src_dma = dma_map_single(dma_chan->device->dev, src,
                                 MV_XOR_TEST_SIZE, DMA_TO_DEVICE);
+       if (dma_mapping_error(dma_chan->device->dev, src_dma)) {
+               dev_err(dma_chan->device->dev,
+                       "Could not map source buffer, disabling\n");
+               err = -ENODEV;
+               goto free_resources;
+       }
 
        tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
                                    MV_XOR_TEST_SIZE,
@@ -1031,10 +1043,23 @@ mv_xor_xor_self_test(struct mv_xor_chan *mv_chan)
        /* test xor */
        dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE,
                                DMA_FROM_DEVICE);
+       if (dma_mapping_error(dma_chan->device->dev, dest_dma)) {
+               dev_err(dma_chan->device->dev,
+                       "Could not map destination page, disabling\n");
+               err = -ENODEV;
+               goto free_resources;
+       }
 
-       for (i = 0; i < MV_XOR_NUM_SRC_TEST; i++)
+       for (i = 0; i < MV_XOR_NUM_SRC_TEST; i++) {
                dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
                                           0, PAGE_SIZE, DMA_TO_DEVICE);
+               if (dma_mapping_error(dma_chan->device->dev, dma_srcs[i])) {
+                       dev_err(dma_chan->device->dev,
+                               "Could not map source page, disabling\n");
+                       err = -ENODEV;
+                       goto free_resources;
+               }
+       }
 
        tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
                                 MV_XOR_NUM_SRC_TEST, PAGE_SIZE, 0);
-- 
1.7.1

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