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dma-mapping: reliably inform about DMA support for IOMMU

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If the DMA IOMMU path is going to be used, the appropriate check should
return that DMA is supported.

Fixes: b5c58b2fdc ("dma-mapping: direct calls for dma-iommu")
Closes: https://lore.kernel.org/all/181e06ff-35a3-434f-b505-672f430bd1cb@notapiano
Reported-by: Nícolas F. R. A. Prado <nfraprado@collabora.com> #KernelCI
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Leon Romanovsky 2024-09-11 13:15:00 +03:00 committed by Christoph Hellwig
parent 038eb433dc
commit f45cfab28f
1 changed files with 3 additions and 0 deletions
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3
kernel/dma/mapping.c
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@ -843,6 +843,9 @@ static int dma_supported(struct device *dev, u64 mask)
if (WARN_ON(ops && use_dma_iommu(dev)))
return false;
if (use_dma_iommu(dev))
return true;
/*
* ->dma_supported sets the bypass flag, so we must always call
* into the method here unless the device is truly direct mapped.