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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
