From 632fd28326c0cc7be9c51ea0d76d8bec39a695e9 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 17 Dec 2012 15:59:52 -0800 Subject: dmatest: implement two helpers to unmap dma memory The unmap_src() and unmap_dst() will be used later as well. Signed-off-by: Andy Shevchenko Reviewed-by: Viresh Kumar Cc: Vinod Koul Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/dma/dmatest.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) (limited to 'drivers/dma/dmatest.c') diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index 24225f0fdcd8..6be893baadd9 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -228,6 +228,20 @@ static void dmatest_callback(void *arg) wake_up_all(done->wait); } +static inline void unmap_src(struct device *dev, dma_addr_t *addr, size_t len, + unsigned int count) +{ + while (count--) + dma_unmap_single(dev, addr[count], len, DMA_TO_DEVICE); +} + +static inline void unmap_dst(struct device *dev, dma_addr_t *addr, size_t len, + unsigned int count) +{ + while (count--) + dma_unmap_single(dev, addr[count], len, DMA_BIDIRECTIONAL); +} + /* * This function repeatedly tests DMA transfers of various lengths and * offsets for a given operation type until it is told to exit by @@ -383,13 +397,8 @@ static int dmatest_func(void *data) } if (!tx) { - for (i = 0; i < src_cnt; i++) - dma_unmap_single(dev->dev, dma_srcs[i], len, - DMA_TO_DEVICE); - for (i = 0; i < dst_cnt; i++) - dma_unmap_single(dev->dev, dma_dsts[i], - test_buf_size, - DMA_BIDIRECTIONAL); + unmap_src(dev->dev, dma_srcs, len, src_cnt); + unmap_dst(dev->dev, dma_dsts, test_buf_size, dst_cnt); pr_warning("%s: #%u: prep error with src_off=0x%x " "dst_off=0x%x len=0x%x\n", thread_name, total_tests - 1, @@ -443,9 +452,7 @@ static int dmatest_func(void *data) } /* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */ - for (i = 0; i < dst_cnt; i++) - dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size, - DMA_BIDIRECTIONAL); + unmap_dst(dev->dev, dma_dsts, test_buf_size, dst_cnt); error_count = 0; -- cgit v1.2.3 From afde3be121efcc658e26f8cc71ead04af96d38f9 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 17 Dec 2012 15:59:53 -0800 Subject: 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 --- drivers/dma/dmatest.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) (limited to 'drivers/dma/dmatest.c') 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, -- cgit v1.2.3