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PCI: Simplify disconnected marking 

Commit 89ee9f7680 ("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@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Oza Pawandeep <poza@codeaurora.org>
Cc: Sinan Kaya <okaya@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Lukas Wunner 2018-08-19 16:29:00 +02:00 committed by Bjorn Helgaas
parent 7876320f88
commit a50ac6bfd6
2 changed files with 5 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/pci/hotplug/pciehp_pci.c
View File

@ -74,6 +74,9 @@ void pciehp_unconfigure_device(struct slot *p_slot)
__func__, pci_domain_nr(parent), parent->number);
pciehp_get_adapter_status(p_slot, &presence);
if (!presence)
pci_walk_bus(parent, pci_dev_set_disconnected, NULL);
pci_lock_rescan_remove();
/*
@ -85,12 +88,6 @@ void pciehp_unconfigure_device(struct slot *p_slot)
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

8
drivers/pci/pcie/err.c
View File

@ -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);