[BUG](-mm)pci_disable_device function clear bars_enabled element

Hi,
I found that in -mm tree, function pci_disable_device() clears bars_enabled variable, so that pci_release_regions can not release reserved PCI I/O and memory resource. Some device driver programs in kernel tree call pci_release_regions function after pci_disable_device(), that will cause some problem.
And I do not know whether pci_disable_device() function should be modified or device drivers should be adjusted.

Thanks
bibo,mao
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