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of: restricted dma: Don't fail device probe on rmem init failure

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If CONFIG_DMA_RESTRICTED_POOL=n then probing a device with a reference
to a "restricted-dma-pool" will fail with a reasonably cryptic error:

  | pci-host-generic: probe of 10000.pci failed with error -22

Rework of_dma_set_restricted_buffer() so that it does not cause probing
failure and instead either returns early if CONFIG_DMA_RESTRICTED_POOL=n
or emits a diagnostic if the reserved DMA pool fails to initialise.

Cc: Claire Chang <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Robin Murphy <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
Will Deacon authored and Konrad Rzeszutek Wilk committed 2021-08-23 06:32:04 -04:00
1 parent ce5cb67c66
commit f3cfd136ae
1 file changed
+8 -5
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drivers/of/device.c
+8 -5
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@@ -53,12 +53,15 @@ int of_device_add(struct platform_device *ofdev)
return device_add(&ofdev->dev);
}
static int
static void
of_dma_set_restricted_buffer(struct device *dev, struct device_node *np)
{
struct device_node *node, *of_node = dev->of_node;
int count, i;
if (!IS_ENABLED(CONFIG_DMA_RESTRICTED_POOL))
return;
count = of_property_count_elems_of_size(of_node, "memory-region",
sizeof(u32));
/*
@@ -79,11 +82,11 @@ of_dma_set_restricted_buffer(struct device *dev, struct device_node *np)
*/
if (of_device_is_compatible(node, "restricted-dma-pool") &&
of_device_is_available(node))
return of_reserved_mem_device_init_by_idx(dev, of_node,
i);
break;
}
return 0;
if (i != count && of_reserved_mem_device_init_by_idx(dev, of_node, i))
dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n");
}
/**
@@ -200,7 +203,7 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
if (!iommu)
return of_dma_set_restricted_buffer(dev, np);
of_dma_set_restricted_buffer(dev, np);
return 0;
}