diff mbox series

[v2,14/17] iommu: Remove pointless iommu_fwspec_free()

Message ID 14-v2-36a0088ecaa7+22c6e-iommu_fwspec_jgg@nvidia.com
State New
Headers show
Series Solve iommu probe races around iommu_fwspec | expand

Commit Message

Jason Gunthorpe Nov. 15, 2023, 2:06 p.m. UTC 
These days the core code will free the fwspec if probe fails, no reason
for any driver to call this on a probe failure path.

Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 14 +++++---------
 drivers/iommu/tegra-smmu.c            |  1 -
 2 files changed, 5 insertions(+), 10 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index d6d1a2a55cc069..854efcb1b84ddf 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1348,6 +1348,8 @@  static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 
 	if (using_legacy_binding) {
 		ret = arm_smmu_register_legacy_master(dev, &smmu);
+		if (ret)
+			return ERR_PTR(ret);
 
 		/*
 		 * If dev->iommu_fwspec is initally NULL, arm_smmu_register_legacy_master()
@@ -1355,15 +1357,12 @@  static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 		 * later use.
 		 */
 		fwspec = dev_iommu_fwspec_get(dev);
-		if (ret)
-			goto out_free;
 	} else if (fwspec && fwspec->ops == &arm_smmu_ops) {
 		smmu = arm_smmu_get_by_fwnode(fwspec->iommu_fwnode);
 	} else {
 		return ERR_PTR(-ENODEV);
 	}
 
-	ret = -EINVAL;
 	for (i = 0; i < fwspec->num_ids; i++) {
 		u16 sid = FIELD_GET(ARM_SMMU_SMR_ID, fwspec->ids[i]);
 		u16 mask = FIELD_GET(ARM_SMMU_SMR_MASK, fwspec->ids[i]);
@@ -1371,20 +1370,19 @@  static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 		if (sid & ~smmu->streamid_mask) {
 			dev_err(dev, "stream ID 0x%x out of range for SMMU (0x%x)\n",
 				sid, smmu->streamid_mask);
-			goto out_free;
+			return ERR_PTR(-EINVAL);
 		}
 		if (mask & ~smmu->smr_mask_mask) {
 			dev_err(dev, "SMR mask 0x%x out of range for SMMU (0x%x)\n",
 				mask, smmu->smr_mask_mask);
-			goto out_free;
+			return ERR_PTR(-EINVAL);
 		}
 	}
 
-	ret = -ENOMEM;
 	cfg = kzalloc(offsetof(struct arm_smmu_master_cfg, smendx[i]),
 		      GFP_KERNEL);
 	if (!cfg)
-		goto out_free;
+		return ERR_PTR(-ENOMEM);
 
 	cfg->smmu = smmu;
 	dev_iommu_priv_set(dev, cfg);
@@ -1408,8 +1406,6 @@  static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 
 out_cfg_free:
 	kfree(cfg);
-out_free:
-	iommu_fwspec_free(dev);
 	return ERR_PTR(ret);
 }
 
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 310871728ab4b6..e3101aa2f35689 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -844,7 +844,6 @@  static int tegra_smmu_configure(struct tegra_smmu *smmu, struct device *dev,
 	err = ops->of_xlate(dev, args);
 	if (err < 0) {
 		dev_err(dev, "failed to parse SW group ID: %d\n", err);
-		iommu_fwspec_free(dev);
 		return err;
 	}