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authorRobin Murphy <robin.murphy@arm.com>2018-11-07 16:30:32 +0000
committerRob Herring <robh@kernel.org>2018-11-08 12:44:34 -0600
commit6778be4e520959659b27a441c06a84c9cb009085 (patch)
tree4332387a5d761de4616ab6d3bf8f057776251ea7 /drivers/of
parentc961cb3be9064d1097ccc019390f8b5739daafc6 (diff)
downloadlinux-6778be4e520959659b27a441c06a84c9cb009085.tar.bz2
of/device: Really only set bus DMA mask when appropriate
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.koskinen@iki.fi> Reported-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi> Tested-by: John Stultz <john.stultz@linaro.org> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Robert Richter <robert.richter@cavium.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/device.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 84e810421418..258742830e36 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",