[v3,1/2] iommu/arm-smmu-v3: don't add a master into smmu_domain before it's ready

Commit Message

Leizhen (ThunderTown) Aug. 23, 2019, 2:45 a.m. UTC

Once a master has been added into smmu_domain->devices, it may immediately
be scaned in arm_smmu_unmap()-->arm_smmu_atc_inv_domain(). From a logical
point of view, the master should be added into smmu_domain after it has
completely initialized.

Signed-off-by: Zhen Lei <[e-mail]>
---
 drivers/iommu/arm-smmu-v3.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Patch

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index c5c93e48b4dbdf7..e0dcc5d27291f8b 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -1958,10 +1958,6 @@  static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 
 	master->domain = smmu_domain;
 
-	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_add(&master->domain_head, &smmu_domain->devices);
-	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
-
 	if (smmu_domain->stage != ARM_SMMU_DOMAIN_BYPASS)
 		arm_smmu_enable_ats(master);
 
@@ -1969,6 +1965,10 @@  static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		arm_smmu_write_ctx_desc(smmu, &smmu_domain->s1_cfg);
 
 	arm_smmu_install_ste_for_dev(master);
+
+	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+	list_add(&master->domain_head, &smmu_domain->devices);
+	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 out_unlock:
 	mutex_unlock(&smmu_domain->init_mutex);
 	return ret;