iommu/arm-smmu: Use helper functions to access dev->iommu_fwspec

Use the new helpers dev_iommu_fwspec_get()/set() to access
the dev->iommu_fwspec pointer. This makes it easier to move
that pointer later into another struct.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/arm-smmu-v3.c

@@ -1696,24 +1696,26 @@ static void arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec)
 
 static void arm_smmu_detach_dev(struct device *dev)
 {
-	struct arm_smmu_master_data *master = dev->iommu_fwspec->iommu_priv;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+	struct arm_smmu_master_data *master = fwspec->iommu_priv;
 
 	master->ste.assigned = false;
-	arm_smmu_install_ste_for_dev(dev->iommu_fwspec);
+	arm_smmu_install_ste_for_dev(fwspec);
 }
 
 static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 {
 	int ret = 0;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_device *smmu;
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct arm_smmu_master_data *master;
 	struct arm_smmu_strtab_ent *ste;
 
-	if (!dev->iommu_fwspec)
+	if (!fwspec)
 		return -ENOENT;
 
-	master = dev->iommu_fwspec->iommu_priv;
+	master = fwspec->iommu_priv;
 	smmu = master->smmu;
 	ste = &master->ste;
 
@@ -1753,7 +1755,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		ste->s2_cfg = &smmu_domain->s2_cfg;
 	}
 
-	arm_smmu_install_ste_for_dev(dev->iommu_fwspec);
+	arm_smmu_install_ste_for_dev(fwspec);
 out_unlock:
 	mutex_unlock(&smmu_domain->init_mutex);
 	return ret;
@@ -1844,7 +1846,7 @@ static int arm_smmu_add_device(struct device *dev)
 	int i, ret;
 	struct arm_smmu_device *smmu;
 	struct arm_smmu_master_data *master;
-	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct iommu_group *group;
 
 	if (!fwspec || fwspec->ops != &arm_smmu_ops)
@@ -1895,7 +1897,7 @@ static int arm_smmu_add_device(struct device *dev)
 
 static void arm_smmu_remove_device(struct device *dev)
 {
-	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_master_data *master;
 	struct arm_smmu_device *smmu;
 

drivers/iommu/arm-smmu.c

@@ -1108,7 +1108,7 @@ static bool arm_smmu_free_sme(struct arm_smmu_device *smmu, int idx)
 
 static int arm_smmu_master_alloc_smes(struct device *dev)
 {
-	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_master_cfg *cfg = fwspec->iommu_priv;
 	struct arm_smmu_device *smmu = cfg->smmu;
 	struct arm_smmu_smr *smrs = smmu->smrs;
@@ -1211,7 +1211,7 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
 static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 {
 	int ret;
-	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_device *smmu;
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 
@@ -1385,7 +1385,7 @@ 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 iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	int i, ret;
 
 	if (using_legacy_binding) {
@@ -1396,7 +1396,7 @@ static int arm_smmu_add_device(struct device *dev)
 		 * will allocate/initialise a new one. Thus we need to update fwspec for
 		 * later use.
 		 */
-		fwspec = dev->iommu_fwspec;
+		fwspec = dev_iommu_fwspec_get(dev);
 		if (ret)
 			goto out_free;
 	} else if (fwspec && fwspec->ops == &arm_smmu_ops) {
@@ -1450,7 +1450,7 @@ static int arm_smmu_add_device(struct device *dev)
 
 static void arm_smmu_remove_device(struct device *dev)
 {
-	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_master_cfg *cfg;
 	struct arm_smmu_device *smmu;
 
@@ -1470,7 +1470,7 @@ static void arm_smmu_remove_device(struct device *dev)
 
 static struct iommu_group *arm_smmu_device_group(struct device *dev)
 {
-	struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_device *smmu = fwspec_smmu(fwspec);
 	struct iommu_group *group = NULL;
 	int i, idx;