[PATCH AUTOSEL 4.9 202/251] iommu/amd: Wait for completion of IOTLB flush in attach_device

Sasha Levin
2020-01-16T17:40:48Z

From: Filippo Sironi <sironi@amazon.de>

[ Upstream commit 0b15e02f0cc4fb34a9160de7ba6db3a4013dc1b7 ]

To make sure the domain tlb flush completes before the
function returns, explicitly wait for its completion.

Signed-off-by: Filippo Sironi <sironi@amazon.de>
Fixes: 42a49f965a8d ("amd-iommu: flush domain tlb when attaching a new device")
[joro: Added commit message and fixes tag]
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/amd_iommu.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index c898c70472bb..bb0448c91f67 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2113,6 +2113,8 @@ static int attach_device(struct device *dev,
*/
domain_flush_tlb_pde(domain);

+ domain_flush_complete(domain);
+
return ret;
}