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Subject[PATCH 2/2] dmatest: check for dma mapping error
Date
We get a warning if CONFIG_DMA_API_DEBUG=y

[ 28.150631] WARNING: at lib/dma-debug.c:933 check_unmap+0x5d6/0x6ac()
[ 28.157058] dw_dmac dw_dmac.0: DMA-API: device driver failed to check map error[device address=0x0000000035698305] [size=14365 bytes] [mapped as single]

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/dma/dmatest.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index b515343..7be60f1 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -378,15 +378,35 @@ static int dmatest_func(void *data)

dma_srcs[i] = dma_map_single(dev->dev, buf, len,
DMA_TO_DEVICE);
+ ret = dma_mapping_error(dev->dev, dma_srcs[i]);
+ if (ret) {
+ unmap_src(dev->dev, dma_srcs, len, i);
+ pr_warn("%s: #%u: mapping error %d with "
+ "src_off=0x%x len=0x%x\n",
+ thread_name, total_tests - 1, ret,
+ src_off, len);
+ failed_tests++;
+ continue;
+ }
}
/* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
for (i = 0; i < dst_cnt; i++) {
dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
test_buf_size,
DMA_BIDIRECTIONAL);
+ ret = dma_mapping_error(dev->dev, dma_dsts[i]);
+ if (ret) {
+ unmap_src(dev->dev, dma_srcs, len, src_cnt);
+ unmap_dst(dev->dev, dma_dsts, test_buf_size, i);
+ pr_warn("%s: #%u: mapping error %d with "
+ "dst_off=0x%x len=0x%x\n",
+ thread_name, total_tests - 1, ret,
+ dst_off, test_buf_size);
+ failed_tests++;
+ continue;
+ }
}

-
if (thread->type == DMA_MEMCPY)
tx = dev->device_prep_dma_memcpy(chan,
dma_dsts[0] + dst_off,
--
1.7.10.4


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