of/device: Set bus DMA mask as appropriate

rmurphy-arm · Christoph Hellwig · commit 6c2fb2ea7636 · 2018-07-27T19:01:05.000+02:00
When an explicit DMA limit is described by firmware, we need to remember
it regardless of how drivers might subsequently update their devices'
masks. The new bus_dma_mask field does that.

Signed-off-by: Robin Murphy &lt;robin.murphy@arm.com&gt;
Acked-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
diff --git a/drivers/of/device.c b/drivers/of/device.c
@@ -149,6 +149,7 @@ int of_dma_configure(struct device *dev, struct device_node *np, bool force_dma)
 	 * set by the driver.
 	 */
 	mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
+	dev->bus_dma_mask = mask;
 	dev->coherent_dma_mask &= mask;
 	*dev->dma_mask &= mask;
 
