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authorChristoph Hellwig <hch@lst.de>2019-01-14 23:14:08 +0300
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2019-01-16 17:59:17 +0300
commit227a76b64718888c1687cc237463aa000ae6fb2b (patch)
treebaf6e0b03405ea007bd7865f1ca75d80fab44001 /kernel
parent1c7fc5cbc33980acd13d668f1c8f0313d6ae9fd8 (diff)
downloadlinux-227a76b64718888c1687cc237463aa000ae6fb2b.tar.xz
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: 55897af63091 ("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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/dma/swiotlb.c2
1 files changed, 2 insertions, 0 deletions
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;
}