of: set dma_mask to point to coherent_dma_mask

Platform devices created by DT code don't initialize dma_mask pointer to
anything. Set it to coherent_dma_mask by default if the architecture
code has not set it.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 9b439ac63d8e..c005495fa382 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -216,6 +216,8 @@ static struct platform_device *of_platform_device_create_pdata(
         dev->archdata.dma_mask = 0xffffffffUL;
 #endif
         dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+        if (!dev->dev.dma_mask)
+                dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
         dev->dev.bus = &platform_bus_type;
         dev->dev.platform_data = platform_data;