diff options
| author |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2012-12-17 15:59:53 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-17 17:15:13 -0800 |
| commit | afde3be121efcc658e26f8cc71ead04af96d38f9 (patch) | |
| tree | 1bc661c87dcdade8fe84ec291cca19704b6d7e6a /drivers/dma | |
| parent | dmatest: implement two helpers to unmap dma memory (diff) | |
| download | linux-dev-afde3be121efcc658e26f8cc71ead04af96d38f9.tar.xz linux-dev-afde3be121efcc658e26f8cc71ead04af96d38f9.zip | |
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 <andriy.shevchenko@linux.intel.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dmatest.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index 6be893baadd9..64b048d7fba7 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, |