[PATCH v2 06/17] iommufd: Use the iommufd_group to avoid duplicate MSI setup

[Jason Gunthorpe <jgg@nvidia.com>]

This only needs to be done once per group, not once per device. The once
per device was a way to make the device list work. Since we are abandoning
this we can optimize things a bit.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/iommufd/device.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index b546250dd1e226..4331c7a4e6831f 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -315,16 +315,16 @@ int iommufd_hw_pagetable_attach(struct iommufd_hw_pagetable *hwpt,
 	if (rc)
 		return rc;
 
-	rc = iommufd_device_setup_msi(idev, hwpt, sw_msi_start);
-	if (rc)
-		goto err_unresv;
-
 	/*
 	 * Only attach to the group once for the first device that is in the
 	 * group. All the other devices will follow this attachment.
 	 * The user can attach every device individually as well.
 	 */
 	if (list_empty(&idev->igroup->device_list)) {
+		rc = iommufd_device_setup_msi(idev, hwpt, sw_msi_start);
+		if (rc)
+			goto err_unresv;
+
 		rc = iommu_attach_group(hwpt->domain, idev->igroup->group);
 		if (rc)
 			goto err_unresv;
-- 
2.39.2