linux-kernel - [PATCH RFC 3/8] arm64: do not initialize arm64_swiotlb if dma

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Date:	Wed, 31 Jul 2013 18:45:27 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	<xen-devel@...ts.xensource.com>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <konrad.wilk@...cle.com>,
	<Stefano.Stabellini@...citrix.com>, <Ian.Campbell@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<catalin.marinas@....com>, <will.deacon@....com>
Subject: [PATCH RFC 3/8] arm64: do not initialize arm64_swiotlb if dma_ops is already set

Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
CC: catalin.marinas@....com
CC: will.deacon@....com
---
 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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