linux-kernel - [PATCH] swiotlb: use dma_direct_supported for swiotlb

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Message-Id: <20180409091517.6619-2-hch@lst.de>
Date:   Mon,  9 Apr 2018 11:15:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     iommu@...ts.linux-foundation.org
Cc:     Dominik Brodowski <linux@...inikbrodowski.net>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] swiotlb: use dma_direct_supported for swiotlb_ops

swiotlb_alloc calls dma_direct_alloc, which can satisfy lower than 32-bit
dma mask requests using GFP_DMA if the architecture supports it.  Various
x86 drivers rely on that, so we need to support that.  At the same time
the whole kernel expects 32-bit dma mask to just work, so the other magic
in swiotlb_dma_support isn't actually needed either.

Reported-by: Dominik Brodowski <linux@...inikbrodowski.net>
Fixes: 6e4bf5867783 ("x86/dma: Use generic swiotlb_ops")
Signed-off-by: Christoph Hellwig <hch@....de>
---
 lib/swiotlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 47aeb04c1997..32aacd0d56a8 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -1087,6 +1087,6 @@ const struct dma_map_ops swiotlb_dma_ops = {
 	.unmap_sg		= swiotlb_unmap_sg_attrs,
 	.map_page		= swiotlb_map_page,
 	.unmap_page		= swiotlb_unmap_page,
-	.dma_supported		= swiotlb_dma_supported,
+	.dma_supported		= dma_direct_supported,
 };
 #endif /* CONFIG_DMA_DIRECT_OPS */
-- 
2.16.3