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dma-mapping: clear dev->dma_mem to NULL after freeing it
[ Upstream commitb07bc23476
] Reproduced with below sequence: dma_declare_coherent_memory()->dma_release_coherent_memory() ->dma_declare_coherent_memory()->"return -EBUSY" error It will return -EBUSY from the dma_assign_coherent_memory() in dma_declare_coherent_memory(), the reason is that dev->dma_mem pointer has not been set to NULL after it's freed. Fixes:cf65a0f6f6
("dma-mapping: move all DMA mapping code to kernel/dma") Signed-off-by: Joakim Zhang <joakim.zhang@cixtech.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 3 additions and 1 deletions
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@ -142,8 +142,10 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
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void dma_release_coherent_memory(struct device *dev)
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{
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if (dev)
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if (dev) {
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_dma_release_coherent_memory(dev->dma_mem);
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dev->dma_mem = NULL;
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}
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}
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static void *__dma_alloc_from_coherent(struct device *dev,
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