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]>
---
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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