[tip:x86/urgent] swiotlb: Use dma_direct_supported() for swiotlb_ops

[tip-bot for Christoph Hellwig <tipbot@zytor.com>]

Commit-ID:  66bdb1478fd1a66d5b8b81e4e28e0ed3df63ed37
Gitweb:     https://git.kernel.org/tip/66bdb1478fd1a66d5b8b81e4e28e0ed3df63ed37
Author:     Christoph Hellwig <hch@lst.de>
AuthorDate: Mon, 9 Apr 2018 11:15:17 +0200
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 9 Apr 2018 18:20:09 +0200

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 a 32-bit DMA mask to just work, so the other magic
in swiotlb_dma_supported() isn't actually needed either.

Reported-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: iommu@lists.linux-foundation.org
Fixes: 6e4bf5867783 ("x86/dma: Use generic swiotlb_ops")
Link: http://lkml.kernel.org/r/20180409091517.6619-2-hch@lst.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 lib/swiotlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index c43ec2271469..c67b06261160 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -1130,6 +1130,6 @@ 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 */