[PATCH v4 03/19] iommu/qcom: Remove detach_dev callback

[Lu Baolu <baolu.lu@linux.intel.com>]

The IOMMU driver supports default domain, so the detach_dev op will never
be called. Remove it to avoid dead code.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/arm/arm-smmu/qcom_iommu.c | 23 -----------------------
 1 file changed, 23 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
index 270c3d9128ba..d7be3adee426 100644
--- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
+++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
@@ -387,28 +387,6 @@ static int qcom_iommu_attach_dev(struct iommu_domain *domain, struct device *dev
 	return 0;
 }
 
-static void qcom_iommu_detach_dev(struct iommu_domain *domain, struct device *dev)
-{
-	struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
-	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-	struct qcom_iommu_dev *qcom_iommu = to_iommu(dev);
-	unsigned i;
-
-	if (WARN_ON(!qcom_domain->iommu))
-		return;
-
-	pm_runtime_get_sync(qcom_iommu->dev);
-	for (i = 0; i < fwspec->num_ids; i++) {
-		struct qcom_iommu_ctx *ctx = to_ctx(qcom_domain, fwspec->ids[i]);
-
-		/* Disable the context bank: */
-		iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0);
-
-		ctx->domain = NULL;
-	}
-	pm_runtime_put_sync(qcom_iommu->dev);
-}
-
 static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova,
 			  phys_addr_t paddr, size_t pgsize, size_t pgcount,
 			  int prot, gfp_t gfp, size_t *mapped)
@@ -583,7 +561,6 @@ static const struct iommu_ops qcom_iommu_ops = {
 	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= qcom_iommu_attach_dev,
-		.detach_dev	= qcom_iommu_detach_dev,
 		.map_pages	= qcom_iommu_map,
 		.unmap_pages	= qcom_iommu_unmap,
 		.flush_iotlb_all = qcom_iommu_flush_iotlb_all,
-- 
2.34.1