[PATCH 2/2] dma-mapping: force unencryped devices are always addressing limited

[Christoph Hellwig]

Devices that are forced to DMA through unencrypted bounce buffers
need to be treated as if they are addressing limited.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 kernel/dma/mapping.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 1dbe6d725962..f6c35b53d996 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -416,6 +416,8 @@ EXPORT_SYMBOL_GPL(dma_get_merge_boundary);
  */
 bool dma_addressing_limited(struct device *dev)
 {
+	if (force_dma_unencrypted(dev))
+		return true;
 	return min_not_zero(dma_get_mask(dev), dev->bus_dma_limit) <
 			    dma_get_required_mask(dev);
 }
-- 
2.20.1