From: Andy Shevchenko Date: Mon, 17 Dec 2012 23:59:53 +0000 (-0800) Subject: dmatest: check for dma mapping error X-Git-Tag: accepted/tizen/common/20141203.182822~3178^2~161 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=afde3be121efcc658e26f8cc71ead04af96d38f9;p=platform%2Fkernel%2Flinux-arm64.git dmatest: check for dma mapping error The kernel emits a warning if CONFIG_DMA_API_DEBUG=y: WARNING: at lib/dma-debug.c:933 check_unmap+0x5d6/0x6ac() dw_dmac dw_dmac.0: DMA-API: device driver failed to check map error[device address=0x0000000035698305] [size=14365 bytes] [mapped as single] Fix this by adding the required checking of the dma_map_single() return value. Signed-off-by: Andy Shevchenko Reviewed-by: Viresh Kumar Cc: Vinod Koul Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index 6be893b..64b048d 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -367,15 +367,35 @@ 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,