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Start for freePCI/pwrctrl: Cancel outstanding rescan work when unregistering
In the Linux kernel, the following vulnerability has been resolved:
PCI/pwrctrl: Cancel outstanding rescan work when unregistering
It's possible to trigger use-after-free here by:
(a) forcing rescan_work_func() to take a long time and (b) utilizing a pwrctrl driver that may be unloaded for some reason
Cancel outstanding work to ensure it is finished before we allow our data structures to be cleaned up.
[bhelgaas: tidy commit log]