[v4,08/27] iommu/arm-smmu-v3: Move allocation of the cdtable into arm_smmu_get_cd_ptr()

Commit Message

Jason Gunthorpe Jan. 26, 2024, 6:15 p.m. UTC

No reason to force callers to do two steps. Make arm_smmu_get_cd_ptr()
able to return an entry in all cases except OOM.

Signed-off-by: Jason Gunthorpe <[e-mail]>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

Patch

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index e4e62f598a0859..7562d7577f3940 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -108,6 +108,7 @@  static struct arm_smmu_option_prop arm_smmu_options[] = {
 static void arm_smmu_rmr_install_bypass_ste(struct arm_smmu_device *smmu);
 static int arm_smmu_domain_finalise(struct arm_smmu_domain *smmu_domain,
 				    struct arm_smmu_device *smmu);
+static int arm_smmu_alloc_cd_tables(struct arm_smmu_master *master);
 
 static void parse_driver_options(struct arm_smmu_device *smmu)
 {
@@ -1190,6 +1191,11 @@  struct arm_smmu_cd *arm_smmu_get_cd_ptr(struct arm_smmu_master *master,
 	struct arm_smmu_device *smmu = master->smmu;
 	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 
+	if (!master->cd_table.cdtab) {
+		if (arm_smmu_alloc_cd_tables(master))
+			return NULL;
+	}
+
 	if (cd_table->s1fmt == STRTAB_STE_0_S1FMT_LINEAR)
 		return (struct arm_smmu_cd *)(cd_table->cdtab +
 					      ssid * CTXDESC_CD_DWORDS);
@@ -2708,12 +2714,6 @@  static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		struct arm_smmu_cd target_cd;
 		struct arm_smmu_cd *cdptr;
 
-		if (!master->cd_table.cdtab) {
-			ret = arm_smmu_alloc_cd_tables(master);
-			if (ret)
-				goto out_list_del;
-		}
-
 		cdptr = arm_smmu_get_cd_ptr(master, IOMMU_NO_PASID);
 		if (!cdptr) {
 			ret = -ENOMEM;