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Subject[PATCH v5 7/8] iommu/vt-d: Avoid sending invalid page response
Date
Page responses should only be sent when last page in group (LPIG) or
private data is present in the page request. This patch avoids sending
invalid descriptors.

Fixes: 5d308fc1ecf53 ("iommu/vt-d: Add 256-bit invalidation descriptor
support")
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/intel-svm.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 62f815e0ae57..4ed7426473c1 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -683,11 +683,10 @@ static irqreturn_t prq_event_thread(int irq, void *d)
if (req->priv_data_present)
memcpy(&resp.qw2, req->priv_data,
sizeof(req->priv_data));
+ resp.qw2 = 0;
+ resp.qw3 = 0;
+ qi_submit_sync(&resp, iommu);
}
- resp.qw2 = 0;
- resp.qw3 = 0;
- qi_submit_sync(&resp, iommu);
-
head = (head + sizeof(*req)) & PRQ_RING_MASK;
}

--
2.7.4
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