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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2012-12-17 15:59:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-17 17:15:13 -0800
commitafde3be121efcc658e26f8cc71ead04af96d38f9 (patch)
tree1bc661c87dcdade8fe84ec291cca19704b6d7e6a
parent632fd28326c0cc7be9c51ea0d76d8bec39a695e9 (diff)
downloadlinux-afde3be121efcc658e26f8cc71ead04af96d38f9.tar.bz2
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>
-rw-r--r--drivers/dma/dmatest.c22
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,