[Xen-devel] [PATCH v5 04/13] arm64: do not initialize arm64_swiotlb if dma_ops is already set

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
CC: will.deacon@xxxxxxx
---
 arch/arm64/mm/dma-mapping.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 4bd7579..a006e84 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -63,6 +63,8 @@ static struct dma_map_ops arm64_swiotlb_dma_ops = {
 
 void __init arm64_swiotlb_init(void)
 {
+       if (dma_ops != NULL)
+               return;
        dma_ops = &arm64_swiotlb_dma_ops;
        swiotlb_init(1);
 }
-- 
1.7.2.5


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