Commit 227a76b6 authored Jan 14, 2019 by Christoph Hellwig Committed by Konrad Rzeszutek Wilk Jan 16, 2019

swiotlb: clear io_tlb_start and io_tlb_end in swiotlb_exit



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: 55897af6 ("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>

parent 1c7fc5cb

kernel/dma/swiotlb.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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