No. You also need to consider situations such as out-of-tree drivers for the same hardware (might not use PCI API), and situations where you have peer devices discovered and used (PCI API doesn't have "hey, <this> device is associated with <current driver>, too" capability)
there's not a lot you or anyone else can do about such broken (and often proprietary) drivers.... if a device doesn't use the kernel API's its end of game basically. Adding more new API's isn't going to help you ...
This specific instance isn't about adding a new API, but using an existing one correctly.
If pci_request_regions() fails, that implies another driver is using the kernel API to let you know the region is unavailable. You should honor that, by not disabling the hardware in that case.
Jeff
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