On Mon, Jan 14, 2019 at 09:14:08PM +0100, Christoph Hellwig wrote:
> 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: 55897af63091 ("dma-direct: merge swiotlb_dma_ops into the dma_direct
> code")
> Reported-by: Sibren Vasse <[email protected]>
> Signed-off-by: Christoph Hellwig <[email protected]>
> Tested-by: Sibren Vasse <[email protected]>
Reviewed-by: Konrad Rzeszutek Wilk <[email protected]>
Thank you!
> ---
> kernel/dma/swiotlb.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index d6361776dc5c..1fb6fd68b9c7 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -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;
> }
> --
> 2.20.1
>
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