diff options
| author | Nathan Chancellor <natechancellor@gmail.com> | 2019-05-29 01:15:32 -0700 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-06-03 12:14:51 +0200 |
| commit | 1b961423158caaae49d3900b7c9c37477bbfa9b3 (patch) | |
| tree | 392b354bd19bac0db1372c737a1c920dbe33966b /drivers/iommu | |
| parent | a84cc69eb53715d37242a21ada398b0d8cd316fc (diff) | |
iommu/dma: Fix condition check in iommu_dma_unmap_sg
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>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 2 |
1 files changed, 1 insertions, 1 deletions
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); /* |