From: Nathan Chancellor <natechancellor@gmail.com>
To: Joerg Roedel <joro@8bytes.org>, Christoph Hellwig <hch@lst.de>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
iommu@lists.linux-foundation.org,
Nathan Chancellor <natechancellor@gmail.com>,
Robin Murphy <robin.murphy@arm.com>
Subject: [PATCH] iommu/dma: Fix condition check in iommu_dma_unmap_sg
Date: Wed, 29 May 2019 01:15:32 -0700 [thread overview]
Message-ID: <20190529081532.73585-1-natechancellor@gmail.com> (raw)
Clang warns:
drivers/iommu/dma-iommu.c:897:6: warning: logical not is only applied to
the left hand side of this comparison [-Wlogical-not-parentheses]
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
^ ~~
drivers/iommu/dma-iommu.c:897:6: note: add parentheses after the '!' to
evaluate the comparison first
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
^
( )
drivers/iommu/dma-iommu.c:897:6: note: add parentheses around left hand
side expression to silence this warning
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
^
( )
1 warning generated.
Judging from the rest of the commit and the conditional in
iommu_dma_map_sg, either
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
or
if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
was intended, not a combination of the two.
I personally think that the former is easier to understand so use that.
Fixes: 06d60728ff5c ("iommu/dma: move the arm64 wrappers to common code")
Link: https://github.com/ClangBuiltLinux/linux/issues/497
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
drivers/iommu/dma-iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 0cd49c2d3770..0dee374fc64a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -894,7 +894,7 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
struct scatterlist *tmp;
int i;
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
iommu_dma_sync_sg_for_cpu(dev, sg, nents, dir);
/*
--
2.22.0.rc1
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next reply other threads:[~2019-05-29 14:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 8:15 Nathan Chancellor [this message]
2019-05-29 10:12 ` [PATCH] iommu/dma: Fix condition check in iommu_dma_unmap_sg Robin Murphy
2019-05-29 12:14 ` Christoph Hellwig
2019-06-03 10:39 ` Joerg Roedel
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