diff mbox series

[v2,7/8] iommu/arm-smmu-v3: Improve add_device() error handling

Message ID 20191108152508.4039168-8-jean-philippe@linaro.org
State Superseded
Headers show
Series [v2,1/8] dt-bindings: document PASID property for IOMMU masters | expand

Commit Message

Jean-Philippe Brucker Nov. 8, 2019, 3:25 p.m. UTC 
Let add_device() clean up after itself. The iommu_bus_init() function
does call remove_device() on error, but other sites (e.g. of_iommu) do
not.

Don't free level-2 stream tables because we'd have to track if we
allocated each of them or if they are used by other endpoints. It's not
worth the hassle since they are managed resources.

Reviewed-by: Eric Auger <eric.auger@redhat.com>

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>

---
 drivers/iommu/arm-smmu-v3.c | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

-- 
2.23.0
diff mbox series

Patch

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 82eac89ee187..88ec0bf33492 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2826,14 +2826,16 @@  static int arm_smmu_add_device(struct device *dev)
 	for (i = 0; i < master->num_sids; i++) {
 		u32 sid = master->sids[i];
 
-		if (!arm_smmu_sid_in_range(smmu, sid))
-			return -ERANGE;
+		if (!arm_smmu_sid_in_range(smmu, sid)) {
+			ret = -ERANGE;
+			goto err_free_master;
+		}
 
 		/* Ensure l2 strtab is initialised */
 		if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) {
 			ret = arm_smmu_init_l2_strtab(smmu, sid);
 			if (ret)
-				return ret;
+				goto err_free_master;
 		}
 	}
 
@@ -2843,13 +2845,25 @@  static int arm_smmu_add_device(struct device *dev)
 		master->ssid_bits = min_t(u8, master->ssid_bits,
 					  CTXDESC_LINEAR_CDMAX);
 
+	ret = iommu_device_link(&smmu->iommu, dev);
+	if (ret)
+		goto err_free_master;
+
 	group = iommu_group_get_for_dev(dev);
-	if (!IS_ERR(group)) {
-		iommu_group_put(group);
-		iommu_device_link(&smmu->iommu, dev);
+	if (IS_ERR(group)) {
+		ret = PTR_ERR(group);
+		goto err_unlink;
 	}
 
-	return PTR_ERR_OR_ZERO(group);
+	iommu_group_put(group);
+	return 0;
+
+err_unlink:
+	iommu_device_unlink(&smmu->iommu, dev);
+err_free_master:
+	kfree(master);
+	fwspec->iommu_priv = NULL;
+	return ret;
 }
 
 static void arm_smmu_remove_device(struct device *dev)