Messages in this thread Patch in this message | | | From | Jacob Pan <> | Subject | [PATCH v3 7/8] iommu/vt-d: Avoid sending invalid page response | Date | Tue, 19 Nov 2019 09:56:31 -0800 |
| |
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> 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 71b85b892c56..4eecc24412dc 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -686,11 +686,10 @@ 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
| |