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From d921eb56b4b0516a0bd46e9337c3deb773146faf Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Tue, 21 Jun 2016 19:58:08 +0200
Subject: [PATCH] pci: Add support for unbinding the generic PCI host
controller
Particularly useful when working in virtual environments where the
controller may come and go, but possibly not only there.
NOTE: leaks memory, see lkml thread!
---
drivers/pci/host/pci-host-common.c | 13 +++++++++++++
drivers/pci/host/pci-host-generic.c | 1 +
include/linux/pci-ecam.h | 1 +
3 files changed, 15 insertions(+)
diff --git a/drivers/pci/host/pci-host-common.c b/drivers/pci/host/pci-host-common.c
index 44a47d4..e0da836 100644
--- a/drivers/pci/host/pci-host-common.c
+++ b/drivers/pci/host/pci-host-common.c
@@ -176,5 +176,18 @@ int pci_host_common_probe(struct platform_device *pdev,
}
pci_bus_add_devices(bus);
+ platform_set_drvdata(pdev, bus);
+ return 0;
+}
+
+int pci_host_common_remove(struct platform_device *pdev)
+{
+ struct pci_bus *bus = platform_get_drvdata(pdev);
+
+ pci_lock_rescan_remove();
+ pci_stop_root_bus(bus);
+ pci_remove_root_bus(bus);
+ pci_unlock_rescan_remove();
+
return 0;
}
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 7d709a7..b35057e 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -63,5 +63,6 @@ static struct platform_driver gen_pci_driver = {
.suppress_bind_attrs = true,
},
.probe = gen_pci_probe,
+ .remove = pci_host_common_remove,
};
builtin_platform_driver(gen_pci_driver);
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 809c2f1..36c9ddb 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -73,5 +73,6 @@ extern struct pci_ecam_ops xgene_v2_pcie_ecam_ops; /* APM X-Gene PCIe v2.x */
/* for DT-based PCI controllers that support ECAM */
int pci_host_common_probe(struct platform_device *pdev,
struct pci_ecam_ops *ops);
+int pci_host_common_remove(struct platform_device *pdev);
#endif
#endif
--
2.1.4
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