Commit 89ee9f768003 ("PCI: Add device disconnected state") iterates over
the devices on a parent bus, marks each as disconnected, then marks
each device's children as disconnected using pci_walk_bus().
The same can be achieved more succinctly by calling pci_walk_bus() on
the parent bus. Moreover, this does not need to wait until acquiring
pci_lock_rescan_remove(), so move it out of that critical section.
The critical section in err.c contains a pci_dev_get() / pci_dev_put()
pair which was apparently copy-pasted from pciehp_pci.c. In the latter
it serves the purpose of holding the struct pci_dev in place until the
Command register is updated. err.c doesn't do anything like that, hence
the pair is unnecessary. Remove it.
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Oza Pawandeep <poza@xxxxxxxxxxxxxx>
Cc: Sinan Kaya <okaya@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/hotplug/pciehp_pci.c | 9 +++------
drivers/pci/pcie/err.c | 8 ++------
2 files changed, 5 insertions(+), 12 deletions(-)
diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
index 18f83e554c73..0322bd4f0a7a 100644
--- a/drivers/pci/hotplug/pciehp_pci.c
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -91,6 +91,9 @@ void pciehp_unconfigure_device(struct slot *p_slot, bool presence)
ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
__func__, pci_domain_nr(parent), parent->number);
+ if (!presence)
+ pci_walk_bus(parent, pci_dev_set_disconnected, NULL);
+
pci_lock_rescan_remove();
/*
@@ -102,12 +105,6 @@ void pciehp_unconfigure_device(struct slot *p_slot, bool presence)
list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
bus_list) {
pci_dev_get(dev);
- if (!presence) {
- pci_dev_set_disconnected(dev, NULL);
- if (pci_has_subordinate(dev))
- pci_walk_bus(dev->subordinate,
- pci_dev_set_disconnected, NULL);
- }
pci_stop_and_remove_bus_device(dev);
/*
* Ensure that no new Requests will be generated from
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 708fd3a0d646..cac406b6e936 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -292,17 +292,13 @@ void pcie_do_fatal_recovery(struct pci_dev *dev, u32 service)
udev = dev->bus->self;
parent = udev->subordinate;
+ pci_walk_bus(parent, pci_dev_set_disconnected, NULL);
+
pci_lock_rescan_remove();
pci_dev_get(dev);
list_for_each_entry_safe_reverse(pdev, temp, &parent->devices,
bus_list) {
- pci_dev_get(pdev);
- pci_dev_set_disconnected(pdev, NULL);
- if (pci_has_subordinate(pdev))
- pci_walk_bus(pdev->subordinate,
- pci_dev_set_disconnected, NULL);
pci_stop_and_remove_bus_device(pdev);
- pci_dev_put(pdev);
}
result = reset_link(udev, service);
--
2.18.0
