From: Jacob Pan jacob.jun.pan@linux.intel.com
[ Upstream commit 5f75585e19cc7018bf2016aa771632081ee2f313 ]
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 Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- 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 ff7a3f9add325..518d0b2d12afd 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -654,11 +654,10 @@ 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; }