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Subject[PATCH v2 3/9] PCI: preserve dev->subordinate until pci_stop_dev() has been called
Date
From: Yijing Wang <wangyijing@huawei.com>

Changeset 2ed168eeb3edec029aa0eca5cb981d6376f931f9 "PCI: Fold stop and
remove helpers into their callers" has changed the behavior when
removing a PCI device.

Previously, for a PCI bridge device with secondary bus, dev->subordinate
is valid when calling PCI bus notification callbacks for
BUS_NOTIFY_ADD_DEVICE/BUS_NOTIFY_DEL_DEVICE events. Now dev->subordinate
has been reset to NULL when calling callbacks for BUS_NOTIFY_DEL_DEVICE
events, which may break some PCI bus notification callbacks.

So revert to the original behavior to keep dev->subordinate valid for
both BUS_NOTIFY_ADD_DEVICE events and BUS_NOTIFY_DEL_DEVICE events.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
drivers/pci/remove.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 86a4636..6244956 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -79,16 +79,16 @@ void pci_stop_and_remove_bus_device(struct pci_dev *dev)
* iterator. Therefore, iterate in reverse so we remove the VFs
* first, then the PF.
*/
- if (bus) {
+ if (bus)
list_for_each_entry_safe_reverse(child, tmp,
&bus->devices, bus_list)
pci_stop_and_remove_bus_device(child);
+ pci_stop_dev(dev);

+ if (bus) {
pci_remove_bus(bus);
dev->subordinate = NULL;
}
-
- pci_stop_dev(dev);
pci_destroy_dev(dev);
}
EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
--
1.7.9.5


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