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

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[ 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>

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Joakim Zhang 2023-12-14 16:25:26 +08:00 • committed by Greg Kroah-Hartman

parent 542da27eac

commit aaf0fc13be

1 changed files with 3 additions and 1 deletions

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kernel/dma/coherent.c

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