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    Subject[patch for-5.8 4/4] dma-direct: add missing set_memory_decrypted() for coherent mapping
    When a coherent mapping is created in dma_direct_alloc_pages(), it needs
    to be decrypted if the device requires unencrypted DMA before returning.

    Fixes: 3acac065508f ("dma-mapping: merge the generic remapping helpers
    into dma-direct")
    Cc: stable@vger.kernel.org # 5.5+
    Signed-off-by: David Rientjes <rientjes@google.com>
    ---
    kernel/dma/direct.c | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
    --- a/kernel/dma/direct.c
    +++ b/kernel/dma/direct.c
    @@ -195,6 +195,12 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
    __builtin_return_address(0));
    if (!ret)
    goto out_free_pages;
    + if (force_dma_unencrypted(dev)) {
    + err = set_memory_decrypted((unsigned long)ret,
    + 1 << get_order(size));
    + if (err)
    + goto out_free_pages;
    + }
    memset(ret, 0, size);
    goto done;
    }
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