From 5f75585e19cc7018bf2016aa771632081ee2f313 Mon Sep 17 00:00:00 2001 From: Jacob Pan Date: Thu, 2 Jan 2020 08:18:09 +0800 Subject: iommu/vt-d: Avoid sending invalid page response 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 Reviewed-by: Eric Auger Signed-off-by: Lu Baolu Signed-off-by: Joerg Roedel --- drivers/iommu/intel-svm.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'drivers/iommu/intel-svm.c') diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index f0410e29fbc1..7c6a6e8b1c96 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -679,11 +679,10 @@ 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; } -- cgit v1.2.3