hulk inclusion
category: bugfix
bugzilla: 20881
CVE: NA
---------------------------

We use a global variable 'slot_being_removed_rescaned' to mark whether a
slot is being removed or rescaned. This will cause a slot hotplug
operation is delayed if another slot is being remove or rescaned. But
if these two slots are under different root ports, they should not
influence each other. This patch make the flag
'slot_being_removed_rescanned' per root port so that one slot hotplug
operation doesn't influence slots below another root port.

We record the root port in struct pci_dev when the pci device is
initialized and added into the system instead of using
'pcie_find_root_port()' to find the root port when we need it. Because
iterating the pci tree needs the protection of
'pci_lock_rescan_remove()'. This will make the problem more complexed
because the lock is very coarse-grained. We don't need to worry about
'use-after-free' because child pci devices are always removed before the
root port device is removed.

Fixes: 764cafd9875e ("pciehp: fix a race between pciehp and removing
operations by sysfs")
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>