On 2021-01-15 05:30, Yong Wu wrote:
On Thu, 2021-01-14 at 13:27 -0600, Rob Herring wrote:
On Mon, Jan 11, 2021 at 07:18:47PM +0800, Yong Wu wrote:
"dev->dma_range_map" contains the devices' dma_ranges information,
This patch moves dma_range_map before of_iommu_configure. The iommu
driver may need to know the dma_address requirements of its iommu
consumer devices.
CC: Rob Herring <robh...@kernel.org>
CC: Frank Rowand <frowand.l...@gmail.com>
Signed-off-by: Yong Wu <yong...@mediatek.com>
---
drivers/of/device.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index aedfaaafd3e7..1d84636149df 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -170,9 +170,11 @@ int of_dma_configure_id(struct device *dev, struct
device_node *np,
dev_dbg(dev, "device is%sdma coherent\n",
coherent ? " " : " not ");
+ dev->dma_range_map = map;
iommu = of_iommu_configure(dev, np, id);
if (PTR_ERR(iommu) == -EPROBE_DEFER) {
kfree(map);
+ dev->dma_range_map = NULL;
Not really going to matter, but you should probably clear dma_range_map
before what it points to is freed.
With that,
Reviewed-by: Rob Herring <r...@kernel.org>
Thanks for the review. I will move it before "kfree(map)" in next
version.
Paul noticed that we already have a bug in assigning to this
unconditionally[1] - I'd totally forgotten about this series when I
theorised about IOMMU drivers wanting the information earlier, but
sweeping my inbox now only goes to show I was right to think of it :)
We should really get something in as a fix independent of this series,
taking both angles into account.
Robin.
[1]
https://lore.kernel.org/linux-arm-kernel/5c7946f3-b56e-da00-a750-be097c7ce...@arm.com/
return -EPROBE_DEFER;
}
@@ -181,7 +183,6 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
- dev->dma_range_map = map;
return 0;
}
EXPORT_SYMBOL_GPL(of_dma_configure_id);
--
2.18.0
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