2 files changed, 6 insertions, 0 deletions

diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index 36dd4f3685f0..b84426a7f88d 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -551,6 +551,8 @@ static void pcistub_remove(struct pci_dev *dev)
                         pr_warn("****** shutdown driver domain before binding device\n");
                         pr_warn("****** to other drivers or domains\n");
 
+                        /* N.B. This ends up calling pcistub_put_pci_dev which ends up
+                         * doing the FLR. */
                         xen_pcibk_release_pci_dev(found_psdev->pdev,
                                                 found_psdev->dev);
                 }
diff --git a/drivers/xen/xen-pciback/xenbus.c b/drivers/xen/xen-pciback/xenbus.c
index a9ed867afaba..4a7e6e0a5f4c 100644
--- a/drivers/xen/xen-pciback/xenbus.c
+++ b/drivers/xen/xen-pciback/xenbus.c
@@ -93,6 +93,8 @@ static void free_pdev(struct xen_pcibk_device *pdev)
 
         xen_pcibk_disconnect(pdev);
 
+        /* N.B. This calls pcistub_put_pci_dev which does the FLR on all
+         * of the PCIe devices. */
         xen_pcibk_release_devices(pdev);
 
         dev_set_drvdata(&pdev->xdev->dev, NULL);
@@ -286,6 +288,8 @@ static int xen_pcibk_remove_device(struct xen_pcibk_device *pdev,
         dev_dbg(&dev->dev, "unregistering for %d\n", pdev->xdev->otherend_id);
         xen_unregister_device_domain_owner(dev);
 
+        /* N.B. This ends up calling pcistub_put_pci_dev which ends up
+         * doing the FLR. */
         xen_pcibk_release_pci_dev(pdev, dev);
 
 out: