From ec849ac664d9faa0d7489eab0bf8778f9ec35c2a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 14 Jan 2019 21:14:08 +0100 Subject: [PATCH] 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: 601f7fb0b0b1 ("dma-direct: merge swiotlb_dma_ops into the dma_direct code") Reported-by: Sibren Vasse Signed-off-by: Christoph Hellwig Tested-by: Sibren Vasse Signed-off-by: Konrad Rzeszutek Wilk --- kernel/dma/swiotlb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index d6361776dc5ce..1fb6fd68b9c7e 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; } -- 2.39.5