[patch for-5.8 4/4] dma-direct: add missing set_memory_decrypted() for coherent mapping

[David Rientjes]

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: sta...@vger.kernel.org # 5.5+
Signed-off-by: David Rientjes <rient...@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;
        }