Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH 1/4] IOMMU: Make dwo drivers use stateless device links | Date | Tue, 29 Jan 2019 00:05:21 +0100 |
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From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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> --- drivers/iommu/exynos-iommu.c | 1 + drivers/iommu/rockchip-iommu.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-pm/drivers/iommu/rockchip-iommu.c =================================================================== --- linux-pm.orig/drivers/iommu/rockchip-iommu.c +++ linux-pm/drivers/iommu/rockchip-iommu.c @@ -1071,7 +1071,8 @@ static int rk_iommu_add_device(struct de 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; } Index: linux-pm/drivers/iommu/exynos-iommu.c =================================================================== --- linux-pm.orig/drivers/iommu/exynos-iommu.c +++ linux-pm/drivers/iommu/exynos-iommu.c @@ -1260,6 +1260,7 @@ static int exynos_iommu_add_device(struc * 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);
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