[PATCH 6.1 487/885] iommu/vt-d: Fix error handling in sva enable/disable paths

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From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

[ Upstream commit 60b1daa3b168fbc648ae2ad28a84759223e49e18 ]

Roll back all previous actions in error paths of intel_iommu_enable_sva()
and intel_iommu_disable_sva().

Fixes: d5b9e4bfe0d8 ("iommu/vt-d: Report prq to io-pgfault framework")
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230208051559.700109-1-baolu.lu@xxxxxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/iommu/intel/iommu.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 644ca49e8cf80..494a872cbf9bd 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4636,8 +4636,12 @@ static int intel_iommu_enable_sva(struct device *dev)
 		return -EINVAL;
 
 	ret = iopf_queue_add_device(iommu->iopf_queue, dev);
-	if (!ret)
-		ret = iommu_register_device_fault_handler(dev, iommu_queue_iopf, dev);
+	if (ret)
+		return ret;
+
+	ret = iommu_register_device_fault_handler(dev, iommu_queue_iopf, dev);
+	if (ret)
+		iopf_queue_remove_device(iommu->iopf_queue, dev);
 
 	return ret;
 }
@@ -4649,8 +4653,12 @@ static int intel_iommu_disable_sva(struct device *dev)
 	int ret;
 
 	ret = iommu_unregister_device_fault_handler(dev);
-	if (!ret)
-		ret = iopf_queue_remove_device(iommu->iopf_queue, dev);
+	if (ret)
+		return ret;
+
+	ret = iopf_queue_remove_device(iommu->iopf_queue, dev);
+	if (ret)
+		iommu_register_device_fault_handler(dev, iommu_queue_iopf, dev);
 
 	return ret;
 }
-- 
2.39.2






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