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Subject[PATCH 1/1] iommu/vt-d: Fix error handling in sva enable/disable paths
Date
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")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
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 a049178cd9f8..36d1867159d7 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4650,8 +4650,12 @@ 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;
}
@@ -4663,8 +4667,12 @@ 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;
}
--
2.34.1
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