[RFC PATCH 2/2] dma-mapping: Use the correct phys_to_dma() for DMA_RESTRICTED_POOL

[Mostafa Saleh <smostafa@google.com>]

As restricted dma pools are always decrypted, in swiotlb.c it uses
phys_to_dma_unencrypted() for address conversion.

However, in DMA-direct, calls to phys_to_dma_direct() with
force_dma_unencrypted() returning false, will fallback to
phys_to_dma() which is inconsistent for memory allocated from
restricted dma pools.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
---
 kernel/dma/direct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 27d804f0473f..1a402bb956d9 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -26,7 +26,7 @@ u64 zone_dma_limit __ro_after_init = DMA_BIT_MASK(24);
 static inline dma_addr_t phys_to_dma_direct(struct device *dev,
 		phys_addr_t phys)
 {
-	if (force_dma_unencrypted(dev))
+	if (force_dma_unencrypted(dev) || is_swiotlb_for_alloc(dev))
 		return phys_to_dma_unencrypted(dev, phys);
 	return phys_to_dma(dev, phys);
 }
-- 
2.53.0.473.g4a7958ca14-goog