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IOMMU: Make dwo drivers use stateless device links

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The device links used by rockchip-iommu and exynos-iommu are
completely managed by these drivers within the IOMMU framework,
so there is no reason to involve the driver core in the management
of these links.

For this reason, make rockchip-iommu and exynos-iommu pass
DL_FLAG_STATELESS in flags to device_link_add(), so that the device
links used by them are stateless.

[Note that this change is requisite for a subsequent one that will
 rework the management of stateful device links in the driver core
 and it will not be compatible with the two drivers in question any
 more.]

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki 2019-02-01 01:54:21 +01:00 committed by Greg Kroah-Hartman
parent a1fdbfbb1d
commit ea4f640025
2 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/iommu/exynos-iommu.c
View File

@ -1260,6 +1260,7 @@ static int exynos_iommu_add_device(struct device *dev)
* direct calls to pm_runtime_get/put in this driver.
*/
data->link = device_link_add(dev, data->sysmmu,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME);
}
iommu_group_put(group);

3
drivers/iommu/rockchip-iommu.c
View File

@ -1071,7 +1071,8 @@ static int rk_iommu_add_device(struct device *dev)
iommu_group_put(group);
iommu_device_link(&iommu->iommu, dev);
data->link = device_link_add(dev, iommu->dev, DL_FLAG_PM_RUNTIME);
data->link = device_link_add(dev, iommu->dev,
DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME);
return 0;
}