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iommu: Ignore -ENODEV errors from add_device call-back

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The -ENODEV error just means that the device is not
translated by an IOMMU. We shouldn't bail out of iommu
driver initialization when that happens, as this is a common
scenario on ARM.

Not returning -ENODEV in the drivers would be a bad idea, as
the IOMMU core would have no indication whether a device is
translated or not. This indication is not used at the
moment, but will probably be in the future.

Fixes: 19762d7 ("iommu: Propagate error in add_iommu_group")
Tested-by: Marek Szyprowski <[email protected]>
Tested-by: Eric Auger <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>
This commit is contained in:
Joerg Roedel 2015-06-29 10:16:08 +02:00
commit 38667f1890
1 changed files with 12 additions and 1 deletions
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13
drivers/iommu/iommu.c
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@ -847,13 +847,24 @@ static int add_iommu_group(struct device *dev, void *data)
{
struct iommu_callback_data *cb = data;
const struct iommu_ops *ops = cb->ops;
int ret;
if (!ops->add_device)
return 0;
WARN_ON(dev->iommu_group);
return ops->add_device(dev);
ret = ops->add_device(dev);
/*
* We ignore -ENODEV errors for now, as they just mean that the
* device is not translated by an IOMMU. We still care about
* other errors and fail to initialize when they happen.
*/
if (ret == -ENODEV)
ret = 0;
return ret;
}
static int remove_iommu_group(struct device *dev, void *data)