[PATCH v5 4/7] iommu/exynos: Set master device once on boot

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



To avoid possible races, set master device pointer in each SYSMMU
controller once on boot. Suspend/resume callbacks now properly relies on
the configured iommu domain to enable or disable SYSMMU controller.
While changing the code, also update the sleep debug messages and make
them conditional.

Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
 drivers/iommu/exynos-iommu.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index f45b274513cc..28e570b53672 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -600,10 +600,12 @@ static int exynos_sysmmu_suspend(struct device *dev)
 	struct sysmmu_drvdata *data = dev_get_drvdata(dev);
 	struct device *master = data->master;
 
-	dev_dbg(dev, "suspend\n");
 	if (master) {
-		__sysmmu_disable(data);
 		pm_runtime_put(dev);
+		if (data->domain) {
+			dev_dbg(data->sysmmu, "saving state\n");
+			__sysmmu_disable(data);
+		}
 	}
 	return 0;
 }
@@ -613,10 +615,12 @@ static int exynos_sysmmu_resume(struct device *dev)
 	struct sysmmu_drvdata *data = dev_get_drvdata(dev);
 	struct device *master = data->master;
 
-	dev_dbg(dev, "resume\n");
 	if (master) {
 		pm_runtime_get_sync(dev);
-		__sysmmu_enable(data);
+		if (data->domain) {
+			dev_dbg(data->sysmmu, "restoring state\n");
+			__sysmmu_enable(data);
+		}
 	}
 	return 0;
 }
@@ -730,7 +734,6 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain)
 		__sysmmu_disable(data);
 		data->pgtable = 0;
 		data->domain = NULL;
-		data->master = NULL;
 		list_del_init(&data->domain_node);
 	}
 
@@ -772,7 +775,6 @@ static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain,
 	spin_lock_irqsave(&domain->lock, flags);
 	list_for_each_entry_safe(data, next, &domain->clients, domain_node) {
 		__sysmmu_disable(data);
-		data->master = NULL;
 		data->pgtable = 0;
 		data->domain = NULL;
 		list_del_init(&data->domain_node);
@@ -806,7 +808,6 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain,
 		data->domain = domain;
 		pm_runtime_get_sync(data->sysmmu);
 		__sysmmu_enable(data);
-		data->master = dev;
 
 		spin_lock_irqsave(&domain->lock, flags);
 		list_add_tail(&data->domain_node, &domain->clients);
@@ -1192,6 +1193,7 @@ static int exynos_iommu_of_xlate(struct device *dev,
 	}
 
 	list_add_tail(&data->owner_node, &owner->controllers);
+	data->master = dev;
 	return 0;
 }
 
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux SoC Development]     [Linux Rockchip Development]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Linux SCSI]     [Yosemite News]

  Powered by Linux