Re: [PATCH v6 4/6] iommu/arm-smmu: Add the device_link between masters and smmu

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On 19/01/18 11:43, Vivek Gautam wrote:
From: Sricharan R <sricharan@xxxxxxxxxxxxxx>

Finally add the device link between the master device and
smmu, so that the smmu gets runtime enabled/disabled only when the
master needs it. This is done from add_device callback which gets
called once when the master is added to the smmu.

Don't we need to balance this with a device_link_del() in .remove_device (like exynos-iommu does)?

Robin.

Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>
---
  drivers/iommu/arm-smmu.c | 11 +++++++++++
  1 file changed, 11 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 95478bfb182c..33bbcfedb896 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1367,6 +1367,7 @@ static int arm_smmu_add_device(struct device *dev)
  	struct arm_smmu_device *smmu;
  	struct arm_smmu_master_cfg *cfg;
  	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct device_link *link;
  	int i, ret;
if (using_legacy_binding) {
@@ -1428,6 +1429,16 @@ static int arm_smmu_add_device(struct device *dev)
pm_runtime_put_sync(smmu->dev); + /*
+	 * Establish the link between smmu and master, so that the
+	 * smmu gets runtime enabled/disabled as per the master's
+	 * needs.
+	 */
+	link = device_link_add(dev, smmu->dev, DL_FLAG_PM_RUNTIME);
+	if (!link)
+		dev_warn(smmu->dev, "Unable to create device link between %s and %s\n",
+			 dev_name(smmu->dev), dev_name(dev));
+
  	return 0;
out_cfg_free:

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