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of/device: Really only set bus DMA mask when appropriate

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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: 6c2fb2ea76 ("of/device: Set bus DMA mask as appropriate")
Reported-by: Aaro Koskinen <[email protected]>
Reported-by: Jean-Philippe Brucker <[email protected]>
Tested-by: Aaro Koskinen <[email protected]>
Tested-by: John Stultz <[email protected]>
Tested-by: Geert Uytterhoeven <[email protected]>
Tested-by: Robert Richter <[email protected]>
Signed-off-by: Robin Murphy <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
This commit is contained in:
Robin Murphy 2018-11-07 16:30:32 +00:00 • committed by Rob Herring
commit 6778be4e52
1 changed files with 3 additions and 1 deletions
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4
drivers/of/device.c
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@ -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",