[PATCH v2 06/42][SRU][U] iommu/amd: Return -ENODEV in add_device when device is not handled by IOMMU

[You-Sheng Yang]

From: Joerg Roedel <jroedel at suse.de>

BugLink: https://bugs.launchpad.net/bugs/1876707

When check_device() fails on the device, it is not handled by the
IOMMU and amd_iommu_add_device() needs to return -ENODEV.

Signed-off-by: Joerg Roedel <jroedel at suse.de>
Link: https://lore.kernel.org/r/20200429133712.31431-7-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel at suse.de>
(cherry picked from commit 57bd2c24ba1673bd47828f6ac5eaaa6292a03582
linux-next)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/iommu/amd_iommu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 524e71ccd5a1..39c68487f67b 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2229,9 +2229,12 @@ static int amd_iommu_add_device(struct device *dev)
 	struct amd_iommu *iommu;
 	int ret, devid;
 
-	if (!check_device(dev) || get_dev_data(dev))
+	if (get_dev_data(dev))
 		return 0;
 
+	if (!check_device(dev))
+		return -ENODEV;
+
 	devid = get_device_id(dev);
 	if (devid < 0)
 		return devid;
-- 
2.25.1