From: Robin Murphy <robin.mur...@arm.com>
[ Upstream commit 6778be4e520959659b27a441c06a84c9cb009085 ]
of_dma_configure() was *supposed* to be following the same logic as
acpi_dma_configure() and only setting bus_dma_mask if some range was
specified by the firmware. However, it seems that subtlety got lost in
the process of fitting it into the differently-shaped control flow, and
as a result the force_dma==true case ends up always setting the bus mask
to the 32-bit default, which is not what anyone wants.
Make sure we only touch it if the DT actually said so.
Fixes: 6c2fb2ea7636 ("of/device: Set bus DMA mask as appropriate")
Reported-by: Aaro Koskinen <aaro.koski...@iki.fi>
Reported-by: Jean-Philippe Brucker <jean-philippe.bruc...@arm.com>
Tested-by: Aaro Koskinen <aaro.koski...@iki.fi>
Tested-by: John Stultz <john.stu...@linaro.org>
Tested-by: Geert Uytterhoeven <geert+rene...@glider.be>
Tested-by: Robert Richter <robert.rich...@cavium.com>
Signed-off-by: Robin Murphy <robin.mur...@arm.com>
Signed-off-by: Rob Herring <r...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/of/device.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 5957cd4fa262..40b9051a7fce 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -149,9 +149,11 @@ 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;
+ /* ...but only set bus mask if we found valid dma-ranges earlier */
+ if (!ret)
+ dev->bus_dma_mask = mask;
coherent = of_dma_is_coherent(np);
dev_dbg(dev, "device is%sdma coherent\n",
--
2.17.1
