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dma-mapping: clear dev->dma_mem to NULL after freeing it

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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>
This commit is contained in:
Joakim Zhang 2023-12-14 16:25:26 +08:00 committed by Christoph Hellwig
parent 55c543865b
commit b07bc23476
1 changed files with 3 additions and 1 deletions
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4
kernel/dma/coherent.c
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@ -132,8 +132,10 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
void dma_release_coherent_memory(struct device *dev)
{
if (dev)
if (dev) {
_dma_release_coherent_memory(dev->dma_mem);
dev->dma_mem = NULL;
}
}
static void *__dma_alloc_from_coherent(struct device *dev,