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swiotlb: clear io_tlb_start and io_tlb_end in swiotlb_exit

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Otherwise is_swiotlb_buffer will return false positives when
we first initialize a swiotlb buffer, but then free it because
we have an IOMMU available.

Fixes: 55897af630 ("dma-direct: merge swiotlb_dma_ops into the dma_direct code")
Reported-by: Sibren Vasse <sibren@sibrenvasse.nl>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Sibren Vasse <sibren@sibrenvasse.nl>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-01-14 21:14:08 +01:00 committed by Konrad Rzeszutek Wilk
parent 1c7fc5cbc3
commit 227a76b647
1 changed files with 2 additions and 0 deletions
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2
kernel/dma/swiotlb.c
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@ -378,6 +378,8 @@ void __init swiotlb_exit(void)
memblock_free_late(io_tlb_start,
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
}
io_tlb_start = 0;
io_tlb_end = 0;
io_tlb_nslabs = 0;
max_segment = 0;
}