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dma-direct: don't call dma_set_decrypted for remapped allocations 

Remapped allocations handle the encrypted bit through the pgprot passed
to vmap, so there is no call dma_set_decrypted.  Note that this case is
currently entirely theoretical as no valid kernel configuration supports
remapped allocations and memory encryption currently.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2021-10-21 09:20:39 +02:00
parent 4d0564785b
commit 5570449b68
1 changed files with 6 additions and 7 deletions
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13
kernel/dma/direct.c
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@ -229,8 +229,6 @@ void *dma_direct_alloc(struct device *dev, size_t size,
__builtin_return_address(0));
if (!ret)
goto out_free_pages;
if (dma_set_decrypted(dev, ret, size))
goto out_free_pages;
memset(ret, 0, size);
goto done;
}
@ -304,12 +302,13 @@ void dma_direct_free(struct device *dev, size_t size,
dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size)))
return;
dma_set_encrypted(dev, cpu_addr, 1 << page_order);
if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr))
if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
vunmap(cpu_addr);
else if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED))
arch_dma_clear_uncached(cpu_addr, size);
} else {
if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED))
arch_dma_clear_uncached(cpu_addr, size);
dma_set_encrypted(dev, cpu_addr, 1 << page_order);
}
__dma_direct_free_pages(dev, dma_direct_to_page(dev, dma_addr), size);
}