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

[ Upstream commit b07bc23476 ]

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>
This commit is contained in:
Joakim Zhang 2023-12-14 16:25:26 +08:00 committed by Greg Kroah-Hartman
parent 48614d528b
commit 4985e507e0
1 changed files with 3 additions and 1 deletions
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4
kernel/dma/coherent.c
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@ -323,8 +323,10 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
static void rmem_dma_device_release(struct reserved_mem *rmem,
struct device *dev)
{
if (dev)
if (dev) {
dev->dma_mem = NULL;
dev->dma_mem = NULL;
}
}
static const struct reserved_mem_ops rmem_dma_ops = {