Simon Xue
ed2c9c09f4
dma-buf: dma-buf-cache: fix concurrency issue
The same dma-buf may attach/map on different cpu at the same time,
this lead to concurrency issue. Add mutex lock to make dma-buf-cache
thread-safe
cpu1 cpu2
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dma_buf_cache_map_attachment dma_buf_cache_map_attachment
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dma_buf_map_attachment dma_buf_map_attachment
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system_heap_map_dma_buf system_heap_map_dma_buf
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iommu_dma_map_sg iommu_dma_map_sg
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__finalise_sg __finalise_sg
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sg_dma_address(sg) = iova1 |
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cache->sg_table = sg_table sg_dma_address(sg) = iova2 + iova1
after add mutex lock
cpu1 cpu2
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dma_buf_cache_map_attachment dma_buf_cache_map_attachment
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mutex_lock mutex_lock
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dma_buf_map_attachment return cache->sg_table
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system_heap_map_dma_buf mutex_unlock
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iommu_dma_map_sg
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__finalise_sg
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sg_dma_address(sg) = iova1
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cache->sg_table = sg_table
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mutex_unlock
Change-Id: I2e08dafe61668ce35467b2c3b074f132f08ed6ba
Signed-off-by: Simon Xue <xxm@rock-chips.com>
2023-02-23 10:22:23 +08:00
..
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